C8m-l-* C8m-h-* Commander™ 8 Modulator Installation

Transcript

C o m m a n d e r ™8 C8M-L-* C8M-H-* Commander™ 8 Modulator Installation and Operation Manual RF TP IF TP GI CORP. EIA CH. 2 5 80 10 15 87.5 20 25 30 RF OUT 95 45 AUDIO DEVIATION (KHz) -20dB STATUS VIDEO MODULATION (%) 20 ENT 50 55 VIDEO AGC 70 AUDIO AGC EXT REF REMOTE TEST VIDEO AURAL Commander ™ 8 C8M-L CAUTION RISK OF ELECTRIC SHOCK CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. Caution These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical shock, do not perform any servicing other than that contained in the Installation and Troubleshooting Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel. Special Symbols That Might Appear on the Equipment This symbol indicates that dangerous voltage levels are present within the equipment. These voltages are not insulated and may be of sufficient strength to cause serious bodily injury when touched. The symbol may also appear on schematics. The exclamation point, within an equilateral triangle, is intended to alert the user to the presence of important installation, servicing, and operating instructions in the documents accompanying the equipment. For continued protection against fire, replace all fuses only with fuses having the same electrical ratings marked at the location of the fuse. This equipment operates over the marked Voltage and Frequency range without requiring manual setting of any selector switches. Different types of line cord sets may be used for connections to the mains supply circuit and should comply with the electrical code requirements of the country of use. This equipment requires a grounding conductor in the line cord. The line cord provided with the equipment is acceptable for use with NEMA Style 5-15R ac receptacles supplying nominal 120 Volts. WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. THE APPARATUS SHALL NOT BE EXPOSED TO DRIPPING OR SPLASHING AND NO OBJECTS FILLED WITH LIQUIDS, SHALL BE PLACED ON THE APPARATUS. CAUTION: TO ENSURE REGULATORY AND SAFETY COMPLIANCE, USE ONLY THE PROVIDED POWER CABLES. It is recommended that the customer install an AC surge arrestor in the AC outlet to which this device is connected. This is to avoid damaging the equipment by local lightning strikes and other electrical surges. FCC Compliance This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the Installation Manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his/her own expense. Any changes or modifications not expressly approved by Motorola could void the user’s authority to operate this equipment under the rules and regulations of the FCC. Canadian Compliance This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numérique de la classe A respects toutes les exigences du Règlement sur le matériel brouilleur du Canada. International Declaration of Conformity We Motorola, Inc. 101 Tournament Drive Horsham, PA 19044, U.S.A. declare under our sole responsibility that the Commander™ 8 Modulator Model C8M-L-* and C8M-H-* to which this declaration relates is in conformity with one or more of the following standards: EMC Standards EN50083-2 CISPR-22 Safety Standards EN60065 following the provisions of the Directive(s) of the Council of the European Union: EMC Directive 89/336/EEC Low Voltage Directive 73/23/EEC Copyright © 2002 by Motorola, Inc. All rights reserved. No part of this publication may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation or adaptation) without written permission from Motorola, Inc. Motorola reserves the right to revise this publication and to make changes in content from time to time without obligation on the part of Motorola to provide notification of such revision or change. Motorola provides this guide without warranty of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Motorola may make improvements or changes in the product(s) described in this manual at any time. General Instrument, the General Instrument logo, and Commander 6 are registered in the US Patent & Trademark Office. Commander is a trademark of Motorola, Inc. MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. © Motorola, Inc. 2002 Contents Section 1 Introduction Related Documentation ...................................................................................................................................................................1-2 Document Conventions ...................................................................................................................................................................1-3 If You Need Help ...............................................................................................................................................................................1-3 Calling for Repairs............................................................................................................................................................................1-3 Section 2 Overview Options ..............................................................................................................................................................................................2-1 C8-DC ........................................................................................................................................................................................2-1 BTSC-SE-C8M ..........................................................................................................................................................................2-1 BTSC-SAP-C8M........................................................................................................................................................................2-1 Model Conventions ..........................................................................................................................................................................2-2 Front Panel Controls and Displays.................................................................................................................................................2-2 Rear Panel .........................................................................................................................................................................................2-4 The Menu System .............................................................................................................................................................................2-7 Changing a Menu Item ............................................................................................................................................................2-8 Main Menu ................................................................................................................................................................................2-9 Input Menu..............................................................................................................................................................................2-10 RF Menu..................................................................................................................................................................................2-12 Video Menu.............................................................................................................................................................................2-14 Audio Menu ............................................................................................................................................................................2-16 BTSC Menu.............................................................................................................................................................................2-18 System Menu..........................................................................................................................................................................2-19 Remote Menu .........................................................................................................................................................................2-20 Warning Messages .........................................................................................................................................................................2-21 Section 3 Installation Before You Begin .............................................................................................................................................................................3-1 Mounting the Modulator...................................................................................................................................................................3-1 Changing the Alias ...........................................................................................................................................................................3-2 Checking the Operation ...................................................................................................................................................................3-3 Input Switching Capabilities............................................................................................................................................................3-4 C8M-*-* Installation and Operation Manual ii Contents Automatic Gain Control................................................................................................................................................................... 3-5 IF AGC ...................................................................................................................................................................................... 3-5 Baseband AGC ........................................................................................................................................................................ 3-5 Audio ................................................................................................................................................................................................. 3-5 Audio AGC ............................................................................................................................................................................... 3-5 Audio Impedance .................................................................................................................................................................... 3-6 Unbalanced Audio................................................................................................................................................................... 3-6 Audio Level .............................................................................................................................................................................. 3-6 Stereo Encoder (Optional)...................................................................................................................................................... 3-6 Selecting the RF Channel Frequency Plan.................................................................................................................................... 3-6 Using Digital Modulation................................................................................................................................................................. 3-6 Typical Interconnections................................................................................................................................................................. 3-7 Basic Video and Audio Interfacing........................................................................................................................................ 3-7 C8M-*-* Connections Using Video B Loop-Through ........................................................................................................... 3-8 Satellite Link Connection ....................................................................................................................................................... 3-9 Satellite Link Connection with C8M-*-* and Stereo Encoder ............................................................................................ 3-10 Video Scrambling.................................................................................................................................................................. 3-11 C8M-*-*/MVP II Connections with Baseband Scrambling and Stereo.............................................................................. 3-12 CW Output.............................................................................................................................................................................. 3-13 Stereo IF Interfacing.............................................................................................................................................................. 3-14 Composite Baseband Video Interfacing with Aural Subcarrier........................................................................................ 3-15 C8M-*-*/MVP II Connections with Audio Privacy and Stereo............................................................................................ 3-16 CMTS/MVP II/C8M-*-* Connections...................................................................................................................................... 3-17 Analog Satellite Receiver/CMTS/MVP II/C8M-*-* Connections ......................................................................................... 3-18 Section 4 Troubleshooting Resetting the C8M-*-*....................................................................................................................................................................... 4-1 Section 5 System Block Diagrams Video to IF Modulation System....................................................................................................................................................... 5-1 Audio to IF Modulation System ...................................................................................................................................................... 5-3 IF Switching and AGC System........................................................................................................................................................ 5-4 IF to Channel Converter System .................................................................................................................................................... 5-5 C8M-*-* Installation and Operation Manual Contents iii Appendix A Specifications RF .................................................................................................................................................................................................. A-1 IF .................................................................................................................................................................................................. A-1 Video................................................................................................................................................................................................. A-2 Audio................................................................................................................................................................................................. A-3 Remote Control................................................................................................................................................................................ A-3 General ............................................................................................................................................................................................. A-3 BTSC-SE-C8M .................................................................................................................................................................................. A-4 BTSC-SAP-C8M ............................................................................................................................................................................... A-4 C8-DC................................................................................................................................................................................................ A-4 Appendix B Frequency Plan Appendix C Changing a Menu Item Appendix D Signal Priority Chart Figures Figure 1-1 Front and rear views of the C8M-*-* ............................................................................................................................1-2 Figure 2-1 C8M-*-* front panel ........................................................................................................................................................2-2 Figure 2-2 C8M-*-* rear panel .........................................................................................................................................................2-4 Figure 2-3 Menu relationships........................................................................................................................................................2-7 Figure 3-1 Operational-check connections...................................................................................................................................3-3 Figure 3-2 Basic video/audio interfacing ......................................................................................................................................3-7 Figure 3-3 C8M-*-* video B loop-through connections................................................................................................................3-8 Figure 3-4 Satellite link connection ...............................................................................................................................................3-9 Figure 3-5 Satellite link connection with stereo encoder..........................................................................................................3-10 Figure 3-6 C8M-*-*/MVP II IF interfacing ......................................................................................................................................3-11 Figure 3-7 C8M-*-*/MVP II/video B loop-through/baseband scrambling and stereo connections ........................................3-12 Figure 3-8 MVP II/C8M-*-* interfacing using the CW output......................................................................................................3-13 Figure 3-9 C8M-*-*/CMTS IF interfacing.......................................................................................................................................3-14 Figure 3-10 External composite baseband connection.............................................................................................................3-15 Figure 3-11 C8M-*-*/MVP II/video B loop-through/audio privacy and stereo connections ....................................................3-16 C8M-*-* Installation and Operation Manual iv Contents Figure 3-12 CMTS/MVP II/C8M-*-*interfacing.............................................................................................................................. 3-17 Figure 3-13 Analog satellite receiver/CMTS/MVP II/C8M-*-* connections ............................................................................... 3-18 Figure 5-1 Video to IF modulation system.................................................................................................................................... 5-1 Figure 5-2 Audio to IF modulation system ................................................................................................................................... 5-3 Figure 5-3 IF switching and AGC system ..................................................................................................................................... 5-4 Figure 5-4 IF to channel converter system................................................................................................................................... 5-5 Tables Table 2-1 Front-panel controls and displays................................................................................................................................ 2-3 Table 2-2 Rear panel features ........................................................................................................................................................ 2-4 Table 2-3 Main menu....................................................................................................................................................................... 2-9 Table 2-4 Input menu .................................................................................................................................................................... 2-10 Table 2-5 RF menu ........................................................................................................................................................................ 2-12 Table 2-6 Video menu ................................................................................................................................................................... 2-14 Table 2-7 Audio menu................................................................................................................................................................... 2-16 Table 2-8 BTSC menu ................................................................................................................................................................... 2-18 Table 2-9 System menu ................................................................................................................................................................ 2-19 Table 2-10 Remote menu.............................................................................................................................................................. 2-20 Table 2-11 Warning messages..................................................................................................................................................... 2-21 Table 4-1 Common fault indications ............................................................................................................................................. 4-1 Table 4-2 Soft and hard resets....................................................................................................................................................... 4-1 Table 5-1 Video to IF modulation system ..................................................................................................................................... 5-2 Table 5-2 Audio to IF modulation system..................................................................................................................................... 5-3 Table 5-3 IF switching and AGC system....................................................................................................................................... 5-4 Table 5-4 IF to channel converter system .................................................................................................................................... 5-5 C8M-*-* Installation and Operation Manual Section 1 Introduction ™ The Commander 8, frequency-agile television signal modulator, model C8M-*-*, accepts a video signal and modulates it onto an RF carrier for transmission in a cable system. The system is packaged in a space saving, 1.75-inch high rack-mounted housing and uses an efficient switching power supply to minimize power consumption and heat. Features of the C8M-*-* include: Frequency selection in 12.5 kHz steps or channel map Two video inputs with automatic source signal switching Video and audio AGC Loop-through video input Front panel user-friendly interface keypad Two IF inputs with automatic IF switching provision Easy to read vacuum florescent display (VFD) Remote interface Integrated BTSC stereo encoder option Integrated BTSC SAP encoder option DC power option 4.5 MHz external subcarrier input Video clamp on burst and/or sync level External phase-lock capability Two versions of the C8M are available: C8M-L-* for low frequencies between 50 MHz and 600 MHz C8M-H-* for high frequencies between 550 MHz and 1000 MHz C8M-*-* Installation and Operation Manual 1-2 Introduction Figure 1-1 illustrates the front and rear views of the C8M-*-* without options: Figure 1-1 Front and rear views of the C8M-*-* STATU S RF OUT VIDEO AGC VIDEO MODULATION (%) RF TP IF TP 20 ENT 5 80 10 87.5 15 20 25 30 95 45 50 55 AUDIO DEVIATION (KHz) 70 Commander ™ 8 TEST VIDEO AURAL C8M-L AUDIO AGC EXT REF REMOTE -20dB REM OTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EX T IN/OUT B- VIDE O IN- A VIDEO B OUT T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P G S G G MA DE IN JAPAN G H B | G H S | G H G H R | L(A) Using This Manual This manual includes information and instructions required to install and operate the C8M-*-*. Section 1 Introduction provides a brief description of the C8M-*-*, related documentation, the helpline number, and information about repair. Section 2 Overview describes the C8M-*-*, identifies the front panel displays and controls, describes the rear panel connectors, and explains the menu system. Section 3 Installation provides instructions on how to install and operate the C8M-*-*. Section 4 Troubleshooting provides information on common error conditions and their resolutions. Section 5 System Block Diagrams describes the operation of the C8M-*-* through a series of diagrams. Appendix A Specifications provide the technical specifications for the C8M-*-*. Appendix B Frequency Plan lists the Frequency Plan. Appendix C Changing a Menu Item illustrates how to change a menu item. Appendix D Signal Priority Chart provides the priority chart for input signals. Related Documentation The following documents describe equipment that can be used with the C8M-*-*: ® C6BD-II Commander 6 Broadcast Demodulator Installation and Operation Manual DSR-4500 Installation Manual AM-OMNI-HCS Installation and Operation Guide Modulating Video Processor Model MVP II Installation Manual OAPL-* Off-Air Phase Lock Installation Manual Stereo Encoder Model CMTS Installation Manual Although these documents provide information that may be of interest to you, they are not necessary to install or operate the C8M-*-* modulator. C8M-*-* Installation and Operation Manual Introduction 1-3 Document Conventions Before you begin using the C8M-*-*, familiarize yourself with the stylistic conventions used in this manual: SMALL CAPS Denotes silk screening on the equipment, typically representing front and rear-panel controls, I/O connections and indicators (LEDs). * (asterisk) Indicates that there are several versions of the same model number and the information applies to all models. When the information applies to a specific model, the complete model number is given. Italic type Denotes a displayed variable, a variable that you must type, or is used for emphasis. Bold type Denotes a system default. If You Need Help If you need assistance while working with the C8M-*-*, contact the Motorola Technical Response Center (TRC): Inside the U.S.: 1-888-944-HELP (1-888-944-4357) Outside the U.S.: 215-323-0044 Online: http://www.motorola.com/broadband, click HTML/Modem Version, click Customer Support, then click Web Support. The TRC is open from 8:00 AM to 7:00 PM Eastern Time, Monday through Friday and 10 AM to 5 PM Eastern Time, Saturday. When the TRC is closed, emergency service only is available on a call-back basis. Web Support offers a searchable solutions database, technical documentation, and low priority issue creation/tracking 24 hours per day, 7 days per week. Calling for Repairs If repair is necessary, call the Motorola Repair Facility at 1-800-227-0450 for a Return for Service Authorization (RSA) number before sending the unit. The RSA number must be prominently displayed on all equipment cartons. The Repair Facility is open from 8:00 AM to 5:00 PM Central Time, Monday through Friday. When calling from outside the United States, use the appropriate international access code and then call 956-541-0600 to contact the Repair Facility. When shipping equipment for repair, follow these steps: 1 Pack the unit securely. 2 Enclose a note describing the exact problem. 3 Enclose a copy of the invoice that verifies the warranty status. 4 Ship the unit PREPAID to the following address: Motorola, Inc. Broadband Communications Sector Attn: RSA #___________ 5401 North Beach Street Dock 122 Fort Worth, Texas 76137 C8M-*-* Installation and Operation Manual Section 2 Overview The C8M-*-* is a frequency-agile modulator offering an output frequency range from 50 MHz to 600 MHz (C8M-L-*) or 550 MHz to 1000 MHz (C8M-H-*). All HRC, IRC, and EIA frequencies are available either by keying in the frequency or using the convenient channel maps. The C8M-*-* provides local control by using a front panel user interface. This interface is a menu system that provides easy access to operating parameters that are microprocessor controlled for accuracy, stability, and reliability. Upon frequency or channel selection, the microprocessor automatically engages internal bandpass filters that ensure a combined carrier-to-noise (c/n) ratio greater than 65 dB without external filtering. The c/n performance is guaranteed in multi-channel combined systems up to 149 channels. The precision frequency stability of the C8M-*-* meets the band frequency accuracy requirements of the FCC. The FCC mandated frequency offsets of +12.5 kHz and +25 kHz are generated automatically. The C8M-*-* also exceeds all FCC RF and baseband signal performance requirements. Options The options available for the C8M-*-* are: DC Power Option Board, model C8-DC Stereo Encoder Option Board, model BTSC-SE-C8M SAP Encoder Option Board, model BTSC-SAP-C8M C8-DC The dc power input option accepts a dc input in the range of −20 to −60 Vdc. This option, which includes a dc-to-dc converter and a rear panel dc inlet, replaces the standard ac power input. This option is only available from the factory. BTSC-SE-C8M The C8M-*-SE is a DSP stereo encoder option for generating stereo sound. It encodes baseband audio based on BTSC standards and employs dbx-TV noise reduction circuitry to ensure a quality signal. BTSC-SAP-C8M The BTSC-SAP-C8M is an additional option board to encode Second Audio Program (SAP). C8M-*-* Installation and Operation Manual 2-2 Overview Model Conventions The model number on your unit will reflect the options that are factory installed. The basic modulator, without any options, is a C8M-L-XX or C8M-H-XX. The naming conventions are shown below: L H (D) dc power (S) Stereo (no SAP) (B) Stereo (with SAP) For example, if your model is C8M-L-BX, the modulator is a low frequency model with the stereo and SAP encoders factory installed. Front Panel Controls and Displays The front panel of the C8M-*-* modulator, illustrated in Figure 2-1, includes an operational display, test ports, a keypad for adjustments, a bar graph, and a status display: Figure 2-1 C8M-*-* front panel 1 2 RF TP IF TP 3 4 5 6 7 STATU S RF OUT VIDEO MODULATION (%) 20 ENT 5 80 10 15 87.5 20 25 30 95 45 AUDIO DEVIATION (KHz) -20dB C8M-*-* Installation and Operation Manual 50 55 VIDEO AGC 70 AUDIO AGC EXT REF REMOTE 8 9 TEST VIDEO AURAL Commander ™ 8 C8M-H Overview 2-3 Table 2-1 describes the items on the C8M-*-* front panel: Table 2-1 Front-panel controls and displays Key Feature Description 1 RF TP The −20 dB RF test point connector provides a sample of the rear panel RF output signal (marked RF OUT). The signal level measured at this connector is −20 dB nominal relative to the RF output level at the rear panel. The distortion performance of the unit should not be measured using this test point. This is an F-type coaxial connector. 2 IF TP The –20 dB IF TEST connector provides a sample of the internal IF signal. This is an F-type coaxial connector. 3 The two line, 24-character, alphanumeric VFD displays operational information for the C8M-*-* on the top line and warning messages on the bottom line. 4 Use the keypad with four arrow keys to navigate through the menus. On reaching the preferred menu item, the right-arrow key is used to access the functions (See Changing a Menu Item in this section). 5 6 The ENT (Enter) key implements changes made to menu items. ENT VIDEO M ODULATION (% ) 20 5 80 10 15 87.5 20 25 30 95 45 50 AUDIO DEV IATION (KHz ) 7 STATUS RF OUT VIDEO AGC AUDIO AGC EXT REF REMOTE 55 70 The LED bar graph monitors depth of video modulation or audio deviation. You can select the preferred function (VIDEO or AUDIO) in the System menu BAR GRAPH. The status display contains six LED indicators. STATUS Green: normal operation Yellow: minor alarm Red: major alarm 8 VIDEO 9 AURAL RF OUT Valid RF output detected VIDEO AGC Video AGC activated AUDIO AGC Audio AGC activated EXT REF External reference input detected REMOTE Remote operation activated The VIDEO test point provides a buffered video output. This is a BNC-type coaxial connector. AURAL test point (4.5 MHz). This is an F-type coaxial connector. C8M-*-* Installation and Operation Manual 2-4 Overview Rear Panel Figure 2-2 illustrates the rear panel of the C8M-*-*: Figure 2-2 C8M-*-* rear panel 1 2 REM OTE OUT IN 3 4 5 6 7 RF OUT REF IN PGM IN AUX IN COMP IF OUT 8 PIF IN 9 PIF OUT SIF IN SIF OUT 10 11 CW OUT EX T IN/OUT 12 13 VIDEO B OUT B- VIDE O IN- A T 2.5A 250V A P G S G G 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag MA DE IN JAPAN 14 G H B | G H S | G H G H R | L(A) 15 Table 2-2 identifies and describes the C8M-*-* rear-panel features: Table 2-2 Rear panel features Key Feature Description This is the power-line connector; a label indicates the input power range. The plastic panel above the power-line connector covers the 250 V fuses. 1 100-240V~,50-60H z,0.5A/0.3A,40W 2 REM OTE OUT IN The REMOTE OUT and IN connectors are used for RS-485 remote control. These are R-J12 connectors. 3 RF OUT RF OUT connector. This is the RF channel output. The modulated video and audio carrier signals appear here. The output level is adjusted through the menu. This is an F-type coaxial connector. 4 R EF IN The REF IN connector is used to apply a reference signal for phase-lock operation. The REF IN frequency must be 6.0000 MHz for IRC, or 6.0003 MHz for HRC. This is an F-type coaxial connector. 5 PGM IN The PGM IN connector accepts a 45.75 MHz analog IF signal or a 44 MHz digital IF signal. This input can accommodate levels from +25 dBmV through +35 dBmV. This is an F-type coaxial connector. 6 AUX IN The AUX IN connector accepts a 45.75 MHz analog IF signal or a 44 MHz digital IF signal. This input can accommodate levels from +25 dBmV through +35 dBmV. This is an F-type coaxial connector. C8M-*-* Installation and Operation Manual Overview Key 7 Feature COMP IF OUT 2-5 Description The COMP IF OUT connector provides a sample of the modulated composite IF signal at a nominal 30 dBmV level. The video and audio correspond to the signal selected from the VIDEO A/B and AUDIO A/B inputs, subcarrier or composite baseband (video plus 4.5 MHz subcarrier inputs). If no video or audio signals are present at the selected input, the signal consists of unmodulated picture and sound carriers. This is an F-type coaxial connector. and PIF IN connectors are jumpered during normal operation. PIF OUT can be used to interface with an IF scrambler. The PIF OUT output is a modulated picture IF carrier at a nominal level of 35 dBmV. Since the PIF IN input precedes a surface acoustic wave (SAW) filter, a composite IF signal (picture IF plus sound IF) should not be applied to the PIF IN connector. These are F-type coaxial connectors. 8 PIF IN PIF OUT PIF OUT 9 SIF IN SIF OUT SIF OUT and SIF IN connectors are jumpered during normal operation. The SIF OUT connector has FM modulated sound IF signal (41.25 MHz) at a nominal level of 10 to 30 dBmV, depending on the audio level selected on the main menu. The SIF IN connector is capable of passing a monophonic or stereo modulated sound IF carrier. These are F-type coaxial connectors. 10 CW OUT 11 EX T IN/O UT 12 The CW OUT connector provides a +53 dBmV nominal unmodulated picture IF carrier for use with the MVP-II video processor or other equipment. This is an F-type coaxial connector. The EXT IN /OUT connector accepts external subcarrier signals (composite video inputs) and outputs internal aural subcarrier signals. This is an F-type coaxial connector. - the video B input is looped through to VIDEO B OUT when SOURCE> B LOOP is selected from the input menu. This is a BNC type coaxial connector. VIDEO B OUT VIDEO B OUT 13 B-V IDEO IN-A VIDEO IN A is the primary video input connector (75-ohm baseband video). VIDEO IN B may be selected through the video menu. These are BNC type coaxial connectors. 14 A P S B G G The terminal block is used to manually select an input. Selections made using this terminal block will override any menu selections. The terminal block abbreviations are: A: AUX IF P: PGM IF S: Sub carrier B: Video B G: Ground To select an input, connect the desired terminal to a ground terminal. This terminal block is primarily used for the Emergency Alert System (EAS) or local advertising insertion applications. Ground closure connections from this equipment can be connected to this terminal block enabling control over the input switching of the upconverter. Simply connect one wire to the terminal and the other to GND. C8M-*-* Installation and Operation Manual 2-6 Overview Key Feature 15 + G B | + G S | + G R + G | L(A) Description The audio terminal block is used to connect baseband audio to the modulator. The terminal block abbreviations are: L (A): Left audio A (or mono audio A) R: Right audio A (for stereo) S: Mono SAP (second audio program) B: Mono audio B G: Ground terminal +: Positive terminal - : Negative terminal All baseband audio inputs are normally a balanced 600-ohm input with a ground. This can be switched to high impedance input (15 kohms) using the menu. All inputs default to the balanced 600-ohm setting with the BTSC option installed and cannot be changed. C8M-*-* Installation and Operation Manual Overview 2-7 The Menu System The C8M-*-* is operated by menus that are accessed by the four arrow keys and the ENT key located on the front panel. The following subsections provide instructions for changing the menu items and descriptions of each menu. Figure 2-3 graphically illustrates the relationships between menus: Figure 2-3 Menu relationships Down Down Main menu Right Input menu Left Up Down RF menu Up Down Right Remote menu Right Up Up Down System menu Down Right Video menu Right Up Up Down Down Right BTSC menu Audio menu Right Up Up The BTSC menu is displayed if the BTSC option is installed. The Audio menu is displayed without the BTSC option installed. C8M-*-* Installation and Operation Manual 2-8 Overview Changing a Menu Item To change a menu item: 1 Press the up- or down-arrow keys to scroll to the INPUT MENU, RF MENU, VIDEO MENU, AUDIO/BTSC MENU, SYSTEM MENU, or REMOTE MENU. 2 Press the right-arrow key to display the first item on the menu selected. 3 Press the up- or down-arrow key to display the menu item you want to change. 4 Press the right-arrow key to select the item. The changeable part of the menu item flashes. If NA is displayed, it indicates not available or not applicable. 5 Press the up- or down-arrow key to display the preferred value or option. 6 Press ENT to implement the change. If you decide not to make the change, press the left-arrow key to exit the menu or take no action. If you take no action, the flashing item reverts to its previous state after a ten-second delay. The display is dimmed after five minutes of inactivity on the front panel and scrolls after another five minutes. Press any key to restore normal operation. See Appendix C, “Changing a Menu Item,” for a graphical representation of how to change a menu item. C8M-*-* Installation and Operation Manual Overview 2-9 Main Menu Table 2-3 illustrates and describes each item on the MAIN MENU: Table 2-3 Main menu Main Menu Appearance Description Identifier for alias and frequency or channel DEFAULT DISPLAY OR Selects INPUT MENU INPUT MENU OR Selects RF MENU RF MENU OR Selects VIDEO MENU VIDEO MENU OR Selects AUDIO MENU (Not displayed with BTSC option installed.) AUDIO MENU OR Selects BTSC MENU (Not displayed without BTSC option installed.) BTSC MENU OR Selects SYSTEM MENU SYSTEM MENU OR REMOTE MENU Selects REMOTE MENU C8M-*-* Installation and Operation Manual 2-10 Overview Input Menu Table 2-4 illustrates and describes each item on the INPUT MENU. Factory default values are shown in bold. Table 2-4 Input menu Input Menu Appearance Description Selects video A and audio A inputs. SOURCE OR Selects video B and audio B inputs. OR Selects video A input with combined video and audio subcarrier input signals. OR Selects video A as active video input with video B input only used for stereo sync source. OR Selects video B input and activates video B output. OR Selects video A and audio subcarrier inputs. OR Selects video B and audio subcarrier inputs. OR No input selected (unmodulated video and audio carrier generated). OR Selects AUX IF input. OR Selects PGM IF input. AUTO B OR C8M-*-* Installation and Operation Manual Switches the automatic use of video B and audio B to on or off. Video B and audio B are selected if video A is missing and AUTO B is on. Overview Input Menu Appearance AUTO AUX OR AUTO PGM 2-11 Description Switches the automatic use of program IF ON or OFF. Auxiliary IF is selected if the main IF input is lost when AUTO AUX is on. Selects AUTO PGM ON or OFF OR AUTO COMP Selects AUTO COMP ON or OFF OR C8M-*-* Installation and Operation Manual 2-12 Overview RF Menu Table 2-5 illustrates and describes each item on the RF MENU. Factory default values are shown in bold. Table 2-5 RF menu RF Menu Appearance FREQUENCY OR CHANNEL OR Description Selects the channel number or frequency of the RF output. The factory defaults are 55.25 MHz and 553.25 MHz. OR Selects the frequency plan. The choices are FREQUENCY, EIA, HRC, and IRC. TUNING MODE OR OR OR CAUTION! If HRC is selected without a valid external reference or if system reference is set to internal, the warning message HRC, NO EXT REF is displayed, and the RF output is turned off. The HRC operation is not allowed for channels 98 or 99. To activate the Frequency mode, enter 108.0250 or 114.0250 and then change REFERENCE to INTERNAL for these channels. C8M-*-* Installation and Operation Manual Overview 2-13 Selects RF level between 0 and 255 (128 is default). RF LEVEL The bar graph indicates the relative number. Press the right arrow key to display a numerical indicator. RF OUTPUT Selects RF output ON or OFF. OR A/V SEPARATION Selects A / V SEPARATION between 0 and 255 (128 is default.) The bar graph indicates the relative number. Press the right arrow key to display a numerical indicator. IF AGC Selects IF AGC ON or OFF. OR Displays NA if IF AGC is on. IF MGC OR Selects IF MGC between 0 and 204 (128 is default.) The bar graph indicates the relative number. Press the right arrow key to display a numerical indicator. C8M-*-* Installation and Operation Manual 2-14 Overview Video Menu Table 2-6 illustrates and describes each item on the VIDEO MENU. Factory default values are shown in bold. Table 2-6 Video menu Video Menu Appearance CLAMP OR Description Toggles video clamp to OFF, SYNC, BURST, or BOTH. For normal operation, clamp should be set to BOTH. OR OR NA when video clamp is set to SYNC, BURST, or BOTH. DC Offset OR Adjusts video dc offset between 0 and 255 (128 is default.) Only available when video clamp is set to OFF. The bar graph indicates the relative number. Press the right arrow key to display a numerical indicator. MOD DEPTH Selects MOD DEPTH between 0 and 255 (128 is default.) The bar graph indicates the relative number. Press the right arrow key to display a numerical indicator. VIDEO AGC Turns video AGC ON or OFF (NA if Clamp = OFF or SYNC). OR C8M-*-* Installation and Operation Manual Overview Video Menu Appearance WHITE CLIP 2-15 Description Select between: OFF, 90 IRE, 95 IRE, 100 IRE, 105 IRE, 110 IRE, 115 IRE, 120 IRE. OR OR OR OR OR OR OR C8M-*-* Installation and Operation Manual 2-16 Overview Audio Menu Table 2-7 illustrates and describes each item on the AUDIO MENU. Factory default values are shown in bold. The AUDIO MENU is not displayed when the BTSC option is installed. Table 2-7 Audio menu Audio Menu Appearance INPUT IMPEDANCE Description Toggles between 600 ohms and HIGH input impedance. OR INPUT RANGE OR AUDIO AGC Toggles between two audio input ranges: HI (+5 to +25 dBm) and LOW (− −10 to +10 dBm). Selects AUDIO AGC ON or OFF. OR AGC PEAK/AVG OR OR OR OR C8M-*-* Installation and Operation Manual Select AGC PEAK/AVG between 6 dB, 9 dB, 12 dB, and 15 dB (N/A if Audio AGC OFF). Overview Audio Menu Appearance AUDIO DEVIATION OR PRE-EMPHASIS 2-17 Description Selects AUDIO DEVIATION between 0 and 255 (128 is default.) (N/A if Audio AGC is ON) The bar graph indicates the relative number. Press the right arrow key to display a numerical indicator. Selects PRE-EMPHASIS ON or OFF. OR Selects 4.5MHz AURAL OUTPUT ON or OFF (N/A if source is COMP or EXT SUB). AURAL OUTPUT OR TEST TONE Selects TEST TONE ON or OFF (400 Hz test tone produces 25 kHz deviation). OR C8M-*-* Installation and Operation Manual 2-18 Overview BTSC Menu Table 2-8 illustrates and describes each item on the BTSC MENU. Factory default values are shown in bold. The BTSC MENU is only displayed when the BTSC option is installed. Table 2-8 BTSC menu BTSC Menu Appearance MODE Description Select between MONO, STEREO, STEREO + SAP (if SAP is present). OR OR STEREO AGC Select between ON and OFF. OR AGC PEAK / AVG Select between 6 dB, 9dB, 12 dB, and 15 dB (N/A if Stereo AGC OFF). OR OR OR Select between ON and OFF. SAP AGC OR AURAL OUTPUT Selects 4.5 MHz AURAL OUTPUT ON or OFF (N/A if source is COMP or EXT SUB). OR C8M-*-* Installation and Operation Manual Overview TEST TONE OR 2-19 Selects TEST TONE ON or OFF. 10.396 kHz Bessel Null test tone produces a 25 kHz deviation when the stereo option is installed and set to mono mode. System Menu Table 2-9 illustrates and describes each item on the SYSTEM MENU. Factory default values are shown in bold. Table 2-9 System menu System Menu Item Appearance Description ALIAS Identifier. BAR GRAPH Selects between VIDEO (depth of modulation) and AUDIO (deviation). OR REFERENCE Selects between INTERNAL and EXTERNAL. OR Only the internal reference is used when selected. When the external reference is selected, the external reference is used, or the internal reference is selected when the external reference is absent. MODEL The RF output is turned off in HRC when the external reference is absent Displays model number (C8M*). SERIAL NUMBER Displays serial number. FIRMWARE REVISION Displays firmware revision number. DISPLAY TEST This item lights all LEDs and VFD segments for testing. Press the right arrow to activate this test. This test lasts for one second. C8M-*-* Installation and Operation Manual 2-20 Overview Remote Menu Table 2-10 illustrates and describes each item on the REMOTE MENU. Factory default values are shown in bold. Table 2-10 Remote menu Remote Menu Item Appearance REMOTE CONTROL Description Selects REMOTE CONTROL ON or OFF. OR BAUD Displays communication rate (38400). This parameter cannot be changed. PHYSICAL ADDRESS Displays physical address number. This parameter cannot be changed. C8M-*-* Installation and Operation Manual Overview 2-21 Warning Messages Front-panel messages warn you of the current status of the C8M-*-*. Table 2-11 identifies and describes all warning messages: Table 2-11 Warning messages Warning Message Alarm Type Meaning NO RF OUT Major Normal RF output not detected USER RF OFF Major RF output turned off by user AURAL UNLOCK Major Aural PLL unlocked CW UNLOCK Major CW PLL unlocked LO1 UNLOCK Major LO1 PLL unlocked LO2 UNLOCK Major LO2 PLL unlocked STEREO UNLOCK Major BTSC Stereo unlocked NO EXT REF Minor Reference selection set to EXTERNAL and external reference not present HRC, NO EXT REF Major HRC tuning mode selected without an external reference present or selected (RF turned off) NO input* Major Selected input not present ALT INPUT, NO input* Minor Input connected to other than selected NO EXT SUB Minor External subcarrier input selected and no subcarrier signal present MEMORY ERROR Major EEPROM memory failure FLASH ERROR Major FLASH memory failure BOOT ERROR Major BOOT memory failure A/D ERROR Major A/D failure The warning message displays the missing selected input (for example, NO VIDEO A). C8M-*-* Installation and Operation Manual Section 3 Installation This section provides step-by-step instructions for installing the C8M-*-*, checking its operation and connecting it to other equipment. In this process, you must perform the following tasks: Mount the modulator. Set all customized features. Select RF channel frequency. Attach cables. Before You Begin Before beginning the installation, check that you have the following items with the C8M-*-*: Power cord Acceptable for use with NEMA Style 5-15R ac receptacles supplying nominal 120 Volts. Two F-type 75-ohm coaxial jumpers Provided to connect SIF IN to SIF OUT and PIF IN to PIF OUT. Two F-type 75-ohm male terminators Provided to terminate CW OUT and COMP IF OUT. Four mounting screws with plastic washers Provided to mount the unit in the rack. Twelve terminal connector Provided for removal or replacement of audio connections. Six terminal connector Provided for removal or replacement of control block. Mounting the Modulator Mount the unit in a standard 19-inch rack. Rear supports are recommended for improved stability. Provide an open space of 1.75 inches between units to enable free airflow. If the equipment operates continuously in a closed cabinet, use forced air circulation to ensure maximum equipment life and optimum performance. CAUTION! To maximize product life, refer to National Electric Code (NEC) guidelines for proper grounding of the C8M-*-* to equipment racks and to the grounding system of the building. To mount the unit: 1 Insert four screws with plastic washers through the mounting holes in the front panel and into the mounting holes in the rack. 2 Tighten all screws. C8M-*-* Installation and Operation Manual 3-2 Installation Changing the Alias To change the alias, select the system menu. The default setting is ALIAS >GI CORP. Press the left or right arrow key to select an ASCII character and then press the up- or down-arrow key to change it. Press the ENT key to save the changes. The maximum length is nine ASCII characters, ranging from SPACE (ASCII 0x20) through uppercase Z (ASCII 0x5A): Blank space . Period ! Exclamation point / Forward slash # Pound sign 0-9 Numbers 0 through 9 $ Dollar sign : Colon % Percentage sign ; Semi-colon & Ampersand < Left bracket ’ Apostrophe = Equal sign ( Left parentheses > Right bracket ) Right parentheses ? Question mark * Asterisk @ At sign + Plus sign A-Z Uppercase letters A through Z - Hyphen C8M-*-* Installation and Operation Manual Installation 3-3 Checking the Operation The connections for the operational check are shown in Figure 3-1. To test the basic operation of the unit: 1 Install an F-type coaxial cable jumper (supplied) between the PIF IN and PIF OUT connectors on the rear panel. 2 Install an F-type coaxial cable jumper (supplied) between the SIF IN and SIF OUT connectors on the rear panel. 3 Install an F-type 75 ohm terminator (supplied) on the COMP IF OUT and IF CW OUT connectors on the rear panel. 4 Plug the unit into an appropriate power line and allow it to warm up for five minutes. 5 Connect a standard baseband video signal generator to the VIDEO IN A connector and a 0 dBm 400 Hz audio test signal into the audio A connector on the rear panel. 6 Connect a receiver to the RF OUT connector on the rear panel through an appropriate attenuator to avoid damage to the receiver. 7 Tune the modulator and the receiver to the same channel. 8 Adjust the depth of modulation to 87.5 percent with a 1.0 Vp-p video input signal using the video modulation adjustment in the video menu. 9 Turn on the internal audio test tone using the audio menu. 10 Verify that a noise-free video signal is displayed on the monitor and that a noise-free audio signal is coming from the speaker. Figure 3-1 Operational-check connections 75-ohm terminator 75-ohm terminator Video signal generator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B G G MADE IN JAPAN + G B | +G S | +G R + G | L(A) G To monitor receiver + Mono audio signal source C8M-*-* Installation and Operation Manual 3-4 Installation Input Switching Capabilities Automatic baseband video, audio input, and IF input switching is available. The following options describe the inputs and automatic switching features of the C8M-*-*: The C8M-*-* has three video connections. VIDEO A is the normal video input. VIDEO B is the secondary video input. EXT IN /OUT is the third connection that accepts a composite video input (video with a frequency modulated aural subcarrier at 4.5 MHz). VIDEO B OUT can be used in a loop-through mode without internal termination. This is a passive loop and the signal must be terminated, usually in another piece of equipment. This loop-through connection provides a clear video sample to the internal BTSC encoder before the video is processed by an external scrambling unit and applied to the VIDEO IN-A input, when the SOURCE> A/B LOOP mode is selected from the input menu. The B LOOP mode can utilize the same video signal elsewhere. If the VIDEO A input signal is missing, the C8M-*-* can automatically switch to VIDEO B input as the backup source. It will return to the VIDEO A input when the unit detects a signal at the VIDEO A input. To activate this feature, select AUTO B > ON from the input menu. The white clip control prevents the luminance level of the video signal from rising above the level set by the menu. If the A or B video input signal is lost, automatic switching to the AUX IF input can be selected from the menu. To activate this feature, select AUTO AUX > ON from the input menu. If the A or B video input signal is lost, automatic switching to the PGM IF input can be selected via the menu. To activate this feature, select AUTO PGM > ON from the input menu. If the video input signal to VIDEO A is missing, the C8M-*-* automatically switches to VIDEO B as the backup source. If VIDEO B is also missing, the unit can switch to the AUX IF input. It will return to the VIDEO B input if a video signal is detected at the VIDEO B input. It will return to VIDEO A when a video signal is detected at the VIDEO A input, even if VIDEO B is present. On the input menu, select AUTO B > ON and AUTO AUX > ON. This application can be used for backup switching capability. If the video signal to the VIDEO A input is missing, the C8M-*-* automatically switches to the VIDEO B input as the backup source. If the VIDEO B input signal is also missing, the unit can switch to the PGM IF input. It will return to the VIDEO B input if a video signal is detected at the VIDEO B input. The unit switches to the VIDEO A input when a video signal is detected at the VIDEO A input, even if VIDEO B is present. On the input menu, select AUTO B > ON and AUTO PGM > ON. If an Emergency broadcast is necessary, you can activate the AUX IN or PGM IN terminal on the rear panel by connecting it to ground. The unit remains switched until the terminal connection to ground is removed. Refer to Key-N under Rear Panel Connections in Section 2, “Overview.” The rear-panel terminal selections have the highest priority. Rear-panel terminal connectors are internally pulled up to +5 V. The C8M-*-* has four balanced audio input connections. The L/A and B inputs are operational with or without the BTSC option installed. Without the BTSC option, the B audio input is automatically selected when the B VIDEO input is selected. The B LOOP mode uses the L/A audio input. With the BTSC option installed, the B audio input replaces the L/A and R audio inputs when the B VIDEO input is selected. L/A and R audio inputs are used when SOURCE> A/ B LOOP mode is selected from the input menu. If the SAP option is installed, the S-audio input is operational. C8M-*-* Installation and Operation Manual Installation 3-5 Automatic Gain Control The following subsections provide information regarding automatic gain control. IF AGC IF AGC is provided so that you can use IF switching without having to critically balance the levels of the IF signal sources. The AGC functions properly with normal clear analog or QAM digital signals. If the sync information is modified by scrambling or by another process, a constant peak reference is longer available for AGC operation. This causes variations in carrier level with picture content. Therefore, IF AGC operation must be turned off when sync suppression scrambling is present. To turn off the IF AGC, go to the RF menu and choose IF AGC OFF. If necessary, you can adjust the IF level manually using the manual gain control menu item. On the RF menu, select IF MGC. Baseband AGC Both video and audio automatic gain controls are provided as standard features. For video, this function maintains a preset video depth of modulation despite changes in video input levels resulting from variations in video source levels or from video source switching. Video AGC operation is based on the amplitude of the video sync pulse and not on the luminance level of the signal. To activate the video AGC, choose VIDEO AGC > ON from the video menu. For audio, this function maintains a preset peak deviation despite changes in audio input levels resulting from audio source variations or from audio switching. Audio AGC operation is based on peak/average signal ratios. To activate the audio AGC, choose AUDIO AGC > ON from the audio menu. Audio The following subsections provide information regarding the parameters associated with the audio signal. Audio AGC The audio AGC adjusts the audio gain to maintain a certain peak to average ratio over a period of time. This ratio can be set to 6, 9, 12, or 15 dB. The AGC is a fast attack / slow decay system, with a fast acting limiter that prevents signals from exceeding the peak setting. Choosing a low value for AGC PEAK/AVG results in a louder signal on average and causes the limiter to activate more frequently. A high AGC PEAK/AVG value results in a less loud signal and causes the limiter to activate less frequently. There is a gain hold function in the AGC that is activated by a large drop in input signal. The gain-hold function waits for the input signal to return to its original level without increasing gain. A gradual decrease in the signal level is compensated for by an increase in gain and does not activate the gain-hold function. C8M-*-* Installation and Operation Manual 3-6 Installation Audio Impedance Audio impedance has two settings: 600 ohms and greater than 15 kohms. The value is set through the audio menu. From the audio menu, choose INPUT IMPEDANCE > 600 Ω or INPUT IMPEDANCE > HIGH, which is greater than 15 kohms. With the BTSC option installed, the impedance is automatically set to 600 ohms and cannot be changed. Unbalanced Audio You can use an unbalanced audio source by connecting it between the G and positive (+) terminals, and connecting the negative (-) and G terminals together. Unbalanced sources are more susceptible to hum and noise pickup. Audio Level There are two ranges for the input audio signal: −10 to +10 dBm and +5 to +25 dBm. The range is set through the audio menu. From the audio menu, choose INPUT RANGE> −10 / +10 dBm, or INPUT RANGE> +5 / +25 dBm. With the BTSC option installed, the input range is automatically set to −10 dBm to +10 dBm and cannot be changed. Stereo Encoder (Optional) When the stereo encoder option is installed in the unit, the following audio parameters cannot be changed: audio input range, input impedance, and pre-emphasis. Audio A can be stereo encoded, while audio B is monaural with the B audio applied to both left and right channels. Selecting the RF Channel Frequency Plan The C8M-*-* meets the FCC Part 76 Frequency Rules. It operates in IRC, HRC, EIA, or FREQUENCY (per EIA-542) modes. The earlier Jerrold or General Instrument Standard Frequency Plan (STD) is no longer implemented. To select a mode, choose TUNING MODE from the RF MENU. Select IRC, HRC, FRQ, or EIA. The FCC requires a 6000.3 kHz reference source, with a tolerance of one hertz, when HRC tuning is selected. IRC tuning requires a 6000.0 kHz external reference source. The RF output for HRC is turned off when the HRC external reference source is absent, since the internal frequency reference sources do not meet FCC requirements. Appendix B, Frequency Plan, illustrates the relationship between channel and frequency for the modes. Using Digital Modulation QAM signals are normally measured in terms of their average power in the occupied bandwidth and stated in terms of dBmV with a 75-ohm load. For QAM signals, the occupied bandwidth is typically 5 MHz. When measuring the output level with a spectrum analyzer that provides a noise marker with a 1 Hz bandwidth, the true level is approximately 67 dB above the level indicated by the noise marker for a 5 MHz wide signal. Avoid overloading the measuring instrument. See the operation manual for equipment procedures on determining proper input level. C8M-*-* Installation and Operation Manual Installation 3-7 Typical Interconnections The following illustrations are presented as examples of common equipment interconnections. Basic Video and Audio Interfacing Figure 3-2 shows the standard connections for video and audio inputs and RF output: Figure 3-2 Basic video/audio interfacing 75-ohm terminator 75-ohm terminator Baseband video C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B GG MADE IN JAPAN + G B | +G S | + G R +G | L(A) G To output combiner network + Mono audio signal source C8M-*-* Installation and Operation Manual 3-8 Installation C8M-*-* Connections Using Video B Loop-Through Figure 3-3 illustrates the connections between the C8M-*-* and other equipment using the video B loop-through: Figure 3-3 C8M-*-* video B loop-through connections Video monitor or other equipment 75-ohm terminator Baseband video 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B G G To output combiner network C8M-*-* Installation and Operation Manual MADE IN JAPAN + G B | + G S | + G R + G | L(A) Installation 3-9 Satellite Link Connection Figure 3-4 shows the connection between an analog satellite receiver and the C8M-*-*: Figure 3-4 Satellite link connection 950-1450 MHz RF input Analog satellite receiver DATA + C A UTION - CLOCK + - ADS5-8 + LANGUAGE OUT - LEFT RIGHT - - +OUT +OUT MONO GND VIDEO OUTPUT +OUT- R IS K OF E L E C T R IC S H O C K CAUTIO N: TO REDUCE T HE RISK OF ELECTRI C SHOCK, DO NOT REMOVE COVER ( OR BACK). NO USER-SERVICEABLE PART S INSIDE. REFER SERVICING T O QUALI FIED SERVICE PERSONNEL . COMPOSITE RF INPUT OUTPUT 950-1450 MHz EXT 70 MHz TRAP LOOP-THRU 950-1460 MHz + - 75-ohm terminator G 75-ohm terminator G + C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B G G MADE IN JAPAN +G B | + G S | + G R +G | L(A) To output combiner network C8M-*-* Installation and Operation Manual 3-10 Installation Satellite Link Connection with C8M-*-* and Stereo Encoder Figure 3-5 shows the connection between an analog satellite receiver and the C8M-*-* with the Stereo Encoder option installed: Figure 3-5 Satellite link connection with stereo encoder 950-1450 MHz RF input Analog satellite receiver DATA + C A UTION - CLOCK + - ADS5-8 + LANGUAGE OUT - LEFT RIGHT MONO GND +OUT - +OUT- +OUT- VIDEO OUTPUT R IS K OF E L E C T R IC S H O C K CAUTIO N: TO REDUCE T HE RISK OF ELECTRI C SHOCK, DO NOT REMOVE COVER ( OR BACK). NO USER-SERVICEABLE PART S INSIDE. REFER SERVICING T O QUALI FIED SERVICE PERSONNEL . COMPOSITE RF INPUT OUTPUT 950-1450 MHz EXT 70 MHz TRAP LOOP-THRU 950-1460 MHz + - + - 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT 75-ohm terminator PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B G G To output combiner network C8M-*-* Installation and Operation Manual MADE IN JAPAN +G B | + G S | + G R +G | L(A) Installation 3-11 Video Scrambling The C8M-*-* can be connected to a Motorola Modulating Video Processor (MVP II) for video and audio scrambling as displayed in Figure 3-6. Motorola recommends using the C8U-* dual upconverter to interface with the MVP II. Figure 3-6 C8M-*-*/MVP II IF interfacing Baseband video - Baseband G audio + MVP II 2 3 5 6 0 1 SERVICE CODE 78 - AUDIO OUT 9A 1 EMUL 9 0 1 9 0 1 9 0 1 75-ohm terminator G + G PROC OUT - VIDEO IN V FILTER AUDIO IN OFF ON D 2 3 4 7 8 REMOTE ADDRESS 5 6 2 3 4 7 8 2 3 5 6 7 8 2 3 4 7 8 2 3 5 6 9 4 0 1 5 6 9 4 7 8 OFF ON 0 1 5 6 7 8 OFF ON + BC 4 AC 115V 240V 35W 345 6 ALARM STDY AUX GND BIPHASE OUT 9 BIPHASE IN F0 1 2 AUX IF INTERCARRIER PIX LO IN IN IN E IF OUT 67 12 OPTIONS 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B G G MADE IN JAPAN + G B | +G S | + G R + G | L(A) To output combiner network When connecting the MVP II to the C8M-*-*, use the IF set up in the MVP II Installation and Operation Manual and the following steps: 1 Verify that the MVP II is in standby mode. 2 Select VIDEO A input on the INPUT MENU and activate IF AGC on the RF MENU display. 3 Tune to a test channel. Ensure that appropriate test equipment is connected to RF OUT on the rear panel. 4 Measure the RF output and check for the following conditions: If the RF video carrier output is less than 60 dBmV, adjust the RF output on the C8M-*-* for 60 dBmV. 5 Deactivate the IF AGC on the RF MENU display and select AUX IF on the INPUT MENU as the input. IF AGC must be turned off in the C8M-*-* when sync suppression scrambling is used. 6 Monitor the test equipment to verify 60 dBmV is still present at the RF output. C8M-*-* Installation and Operation Manual 3-12 Installation If the RF level is not 60 dBmV, the COMP IF control on the MVP II can be adjusted. Do not exceed 32 dBmV at the IF output of the MVP II. If the RF level is still not 60 dBmV, use manual IF gain control on the option menu to set RF level. Do not use RF level control to set the RF output level at this stage. C8M-*-*/MVP II Connections with Baseband Scrambling and Stereo Figure 3-7 illustrates the connections between the C8M-*-* and MVP II using the video B loop-through: Figure 3-7 C8M-*-*/MVP II/video B loop-through/baseband scrambling and stereo connections MVP II ALARM STDY AUX GND BIPHASE OUT 0 1 SERVICE CODE 34 56 5 6 2 3 2 3 2 3 9 2 3 4 78 G - AUDIO OUT 9A + G PROC OUT - VIDEO IN V FILTER AUDIO IN CD 9 0 1 9 0 1 9 0 1 REMOTE ADDRESS 5 6 7 8 2 3 4 7 8 2 3 5 6 0 1 4 9 5 6 7 8 OFF ON 4 7 8 OFF ON 5 6 7 8 7 8 AC 115V 240V 35W 4 0 1 5 6 + B 4 9 BIPHASE IN F0 1 2 AUX IF INTERCARRIER PIX LO IN IN IN E IF OUT 1 EMUL OFF ON 67 12 OPTIONS Baseband video 75-ohm terminator 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B G G + G B MADE IN JAPAN + To output combiner network C8M-*-* Installation and Operation Manual Baseband stereo audio R G - L + G - | +G S | + G R +G | L(A) Installation 3-13 CW Output The CW output is a 45.75 MHz carrier signal that can be used with the MVP II when it is necessary to insert a coherent IF carrier for phase-locked upconversions. Figure 3-8 illustrates the connection between the C8M-*-* and the MVP II in a phase-locked upconversion: Figure 3-8 MVP II/C8M-*-* interfacing using the CW output for phase lock Baseband video - Baseband G audio + MVP II ALARM STDY AUX GND BIPHASE OUT 0 1 SERVICE CODE 345 6 - AUDIO OUT 9 78 A 5 6 2 3 2 3 2 3 9 2 3 4 G + G PROC OUT - 1 EMUL VIDEO IN V FILTER AUDIO IN OFF ON D 9 0 1 9 9 0 1 0 1 REMOTE ADDRESS 5 6 7 8 2 3 4 7 8 2 3 5 6 0 1 4 9 5 6 7 8 OFF ON 4 7 8 OFF ON 5 6 7 8 7 8 AC 115V 240V 35W 4 0 1 5 6 + BC 4 9 BIPHASE IN F0 1 2 AUX IF INTERCARRIER PIX LO IN IN IN E IF OUT 67 12 OPTIONS PIX LO switch must be on 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B G G MADE IN JAPAN + G B | + G S | +G R + G | L(A) To output combiner network C8M-*-* Installation and Operation Manual 3-14 Installation Stereo IF Interfacing The CMTS stereo encoder can be used with the C8M-*-* as shown in Figure 3-9. To activate the subcarrier input, select SOURCE> A/EXT SUB or SOURCE> B/EXT SUB from the input menu or short the subcarrier terminal on the rear panel to the ground terminal. Use the level adjustment on the CMTS front panel to adjust the RF output sound carrier level: Figure 3-9 C8M-*-*/CMTS IF interfacing L Baseband stereo audio G Baseband video + R G CMTS + 4.5 MHz COMPOSITE IF OUTPUT OUT AC 115V VIDEO LOOPTHRU IF INPUT + GND - ST/ GND A/B GND + GND SAP IN MONO REMOTE POWER BASE BAND OUT + GND RIGHT + GND - INPUT B LEFT 75-ohm terminator + GND RIGHT + GND - INPUT A LEFT OUT IN 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V A P S B GG 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag To output combiner network C8M-*-* Installation and Operation Manual MADE IN JAPAN +G B | +G S | + G R +G | L(A) Installation 3-15 Composite Baseband Video Interfacing with Aural Subcarrier To use the external composite baseband input, connect the unit as shown in Figure 3-10. To activate, select SOURCE> COMPOSITE from the input menu or short the subcarrier terminal on the rear panel to the ground terminal. Menu selection is recommended. The short on the rear panel is not required if SOURCE> COMPOSITE is selected using the input menu: Figure 3-10 External composite baseband connection 75-ohm terminator 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT Composite baseband (video and audio subcarrier) EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B G G MADE IN JAPAN + G B | +G S | + G R +G | L(A) To output combiner network C8M-*-* Installation and Operation Manual 3-16 Installation C8M-*-*/MVP II Connections with Audio Privacy and Stereo Figure 3-11 illustrates the connections between the MVP II and C8M-*-* using the video B loop-through: Figure 3-11 C8M-*-*/MVP II/video B loop-through/audio privacy and stereo connections MVP II ALARM STDY AUX GND BIPHASE OUT 0 1 5 6 SERVICE CODE 34 5 6 4 2 3 2 3 2 3 2 3 9 9 0 1 2 3 5 6 7 8 9 0 1 2 3 4 7 8 9 0 1 REMOTE ADDRESS 5 6 0 1 4 9 5 6 7 8 OFF ON 4 7 8 OFF ON 5 6 7 8 7 8 AC 115V 240V 35W 4 0 1 5 6 78 + G - AUDIO OUT 9A + G - PROC OUT 1 EMUL VIDEO IN V FILTER AUDIO IN BCD 4 9 BIPHASE IN F0 1 2 AUX IF INTERCARRIER PIX LO IN IN IN E IF OUT OFF ON 67 12 OPTIONS Intercarrier switch must be on 75-ohm terminator Baseband video 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B GG +G B MADE IN JAPAN + To output combiner network C8M-*-* Installation and Operation Manual Baseband stereo audio R G - L + G - | + G S | +G R +G | L(A) Installation 3-17 CMTS/MVP II/C8M-*-* Connections Figure 3-12 illustrates the connections between the CMTS, MVP II, and C8M-*-*: Figure 3-12 CMTS/MVP II/C8M-*-*interfacing L Baseband stereo audio G Baseband video + R G CMTS + 4.5 MHz COMPOSITE OUT IF OUTPUT AC 115V VIDEO LOOPTHRU IF INPUT + GND - ST/ GND A/B GND + GND SAP IN MONO + GND RIGHT BASE BAND OUT REMOTE POWER + GND - + GND - LEFT INPUT B RIGHT + GND - INPUT A LEFT OUT IN MVP II ALARM STDY AUX GND BIPHASE OUT 0 1 5 6 SERVICE CODE 3 456 4 2 3 2 3 2 3 2 3 9 9 0 1 2 3 5 6 7 8 9 0 1 2 3 4 7 8 9 0 1 REMOTE ADDRESS 5 6 0 1 4 9 5 6 7 8 OFF ON 4 7 8 OFF ON 5 6 7 8 7 8 AC 115V 240V 35W 4 0 1 5 6 78 + G - AUDIO OUT 9A + G PROC OUT - 1 EMUL VIDEO IN V FILTER AUDIO IN BC D 4 9 BIPHASE IN F0 1 2 AUX IF INTERCARRIER PIX LO IN IN IN E IF OUT OFF ON 67 12 OPTIONS Intercarrier switch must be on 75-ohm terminator 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag A P S B GG MADE IN JAPAN +G B | +G S | + G R +G | L(A) To output combiner network C8M-*-* Installation and Operation Manual 3-18 Installation Analog Satellite Receiver/CMTS/MVP II/C8M-*-* Connections Figure 3-13 illustrates the connections between an analog satellite receiver, CMTS, MVP II and C8M-*-*: Figure 3-13 Analog satellite receiver/CMTS/MVP II/C8M-*-* connections 950-1450 MHz RF input Analog satellite receiver DATA - + C A UTION CLOCK - + ADS5-8 + LANGUAGE OUT - LEFT RIGHT MONO GND +OUT - +OUT - +OUT- VIDEO OUTPUT R IS K OF E L E C T R IC S H O C K CAUTIO N: TO REDUCE T HE RISK OF ELECTRI C SHOCK, DO NOT REMOVE COVER ( OR BACK). NO USER-SERVICEABLE PART S INSI DE. REFER SERVICING T O QUALIFIED SERVICE PERSONNEL . COMPOSITE RF INPUT OUTPUT 950-1450 MHz EXT 70 MHz TRAP LOOP-THRU 950-1460 MHz CMTS 4.5 MHz COMPOSITE OUT IF OUTPUT AC 115V VIDEO LOOPTHRU IF INPUT + GND - ST/ GND A/B GND + GND SAP IN MONO + GND RIGHT BASE BAND OUT REMOTE POWER + GND - + GND - LEFT INPUT B RIGHT + GND - INPUT A LEFT OUT IN MVP II ALARM STDY AUX GND BIPHASE OUT 0 1 5 6 SERVICE CODE 3 456 4 2 3 2 3 2 3 2 3 9 9 0 1 2 3 5 6 7 8 9 0 1 2 3 4 7 8 9 0 1 REMOTE ADDRESS 5 6 0 1 4 9 5 6 7 8 OFF ON 4 7 8 OFF ON 5 6 7 8 7 8 AC 115V 240V 35W 4 0 1 5 6 78 + G - AUDIO OUT 9A + G PROC OUT - 1 EMUL VIDEO IN V FILTER AUDIO IN BC D 4 9 BIPHASE IN F0 1 2 AUX IF INTERCARRIER PIX LO IN IN IN E IF OUT OFF ON 67 12 OPTIONS Intercarrier switch must be on 75-ohm terminator 75-ohm terminator C8M-*-* REMOTE OUT IN RF OUT REF IN PGM IN AUX IN COMP IF OUT PIF IN PIF OUT SIF IN SIF OUT CW OUT EXT IN/OUT VIDEO B OUT B-VIDEO IN-A T 2.5A 250V A P S B GG 100-240V~,50-60Hz,0.5A/0.3A,40W Time-lag To output combiner network C8M-*-* Installation and Operation Manual MADE IN JAPAN +G B | +G S | + G R +G | L(A) Section 4 Troubleshooting This section provides information to help you isolate and resolve common error conditions reported by the C8M-*-*. In addition, it provides maintenance recommendations if an alarm indicator LED lights or if the unit fails to power up. Check the meaning of warning messages displayed on the front panel in Section 2, “Overview,” Warning Messages. If you need assistance, call the Technical Response Center (TRC) at 1-888-944-HELP (1-888-944-4357). Table 4-1 describes problems, possible causes, and corrective actions for common C8M-*-* error conditions: Table 4-1 Common fault indications Problem Possible Cause Corrective Action The RF output turns off automatically and the warning message HRC, NO EXT REF is displayed on the front panel. No valid external reference is present, or the system reference is set to internal. Provide valid external reference. Not able to change IF input source. Rear-panel selection is activated. Remove rear panel GND connection on terminal strip. Not able to change parameters. Remote control is on. Turn remote control off. Data entered at the menu is not retained. Menus are on a timer and return to the previous screen if ENT is not pressed after entering data. Press ENT when desired value is reached. Resetting the C8M-*-* You can reset the C8M-*-* from the front panel without cycling the ac or dc power. Two types of resets are available: a soft reset that is equivalent to cycling the power to the unit and a hard reset that returns most parameters to their factory default values. Table 4-2 describes both resets: Table 4-2 Soft and hard resets Type of Reset Action to Perform To Perform a Soft Reset Briefly press both the ENT and LEFT ARROW keys then release them. The C8M-*-* will go through a normal power-up test sequence that takes about 5 seconds to complete. No parameters are changed by a soft reset. To Perform a Hard Reset Press both the ENT and left-arrow keys then release the LEFT ARROW key. Continue to press the ENT key until the test sequence completes in about 5 seconds. All factory defaults will be restored except the following: RF LEVEL, A/V SEPARATION, IF MGC level, DC OFFSET, MOD DEPTH, AUDIO DEVIATION. C8M-*-* Installation and Operation Manual Section 5 System Block Diagrams This section describes the operation of the C8M-*-* through a series of block diagrams. The text is keyed to letters on the block diagrams. Video to IF Modulation System Figure 5-1 Video to IF modulation system A video in Level sensor Termination E B SW1 D SW4 E SW5 Burst clamp Video AGC B video in Level sensor White clip Termination IF modulator C J K Delay equalizer BPF Picture IF output Sync clamp SW2 L H Video TP B video out 45.75 MHz VCO PLL 8 MHz ref Video to BTSC encoder SW6 F Level sensor 4.5 MHz BRF Level sensor 4.5 MHz BPF Composite in 4.5 MHz out G SW7 4.5 MHz to modulator 4.5 MHz from modulator Ext in/out SW0 A C8M-*-* Installation and Operation Manual 5-2 System Block Diagrams Table 5-1 Video to IF modulation system Key Description A Switch SW0 selects EXT IN/OUT as an internal aural subcarrier output or external aural subcarrier input. B Switch SW1 selects A or B video input for the modulator. C Switch SW2 selects normal or loop-through operation for B input. D Switch SW4 selects A/B input or loop-through B input for the modulator. E Switch SW5 selects composite video input or other inputs to modulator. F Switch SW6 selects a synchronizing video signal for the BTSC encoder from the B LOOP or normal A/B input. G Switch SW7 selects an internal or external generated 4.5 MHz aural subcarrier. H Front panel test point to sample processed video. I Supports amplitude modulation. J The modulated IF output is buffered and then applied to an all-pass delay equalizer which corrects the total group delay response generated by the C8M-*-* system. K The signal is bandpass filtered to remove unwanted frequencies at the PIF OUT connector on the rear panel. L The unmodulated 45.75 MHz carrier is generated by a phase-locked loop that locks a voltage controlled oscillator to an internal 8 MHz reference. When a 6 MHz external reference is used, the PLLs adapt to this frequency. C8M-*-* Installation and Operation Manual System Block Diagrams 5-3 Audio to IF Modulation System Figure 5-2 Audio to IF modulation system A B audio in SAP audio in BTSC encoder (optional) Video sample B Impedance Range C SW3 R audio in G E D Mixer VCO AGC Preemphasis 9.0 MHz H SIF out SAW BPF F/2 L (A) audio in 45.75 MHz LO Phase detector Limiting AMP 8.0 MHz ref External 4.5 MHz input Aural TP Sound IF level control F Table 5-2 Audio to IF modulation system Key Description A The BTSC option board bypasses internal audio processing and provides all audio processing for the left, right, B, and SAP paths. The composite baseband audio output of the BTSC option board drives the frequency modulator directly. B Switch SW3 selects A or B audio input. C Frequency modulation is accomplished by applying the processed audio signal to a 9.0 MHz voltage controlled oscillator (VCO). The center frequency of the sound carrier is precisely maintained by a phase-locked loop with an internal 8.0 MHz reference. D The audio VCO’s frequency is divided by two to produce the standard 4.5 MHz aural subcarrier frequency. E An input switch is furnished to select an external 4.5 MHz aural subcarrier. F Front panel test point to sample aural subcarrier. G The subcarrier is mixed with the unmodulated 45.75 MHz signal to create the 41.25 MHz sound IF frequency. H The sound IF carrier is bandpass filtered and applied to an amplifier whose gain is controlled by the A/V separation entry on the RF menu. This control sets the desired picture/sound carrier level ratio. C8M-*-* Installation and Operation Manual 5-4 System Block Diagrams IF Switching and AGC System Figure 5-3 IF switching and AGC system A Picture IF input E B D Comp IF out SAW VSBF Sound IF input C G H BPF AGC BPF Auxiliary IF input IF to converter output I F IF test Program IF input From microprocessor logic Table 5-3 IF switching and AGC system Key Description A The picture IF signal input is taken from the rear panel connectors. This signal is amplified to compensate for the loss of the surface acoustic wave (SAW) filter that follows. B This filter generates the required television vestigial sideband response shape and eliminates unwanted frequencies. C The sound IF signal input is taken from the rear panel connectors. A bandpass filter removes unwanted frequencies. D The filtered IF signals are combined to produce a composite IF signal. E The signal is split and buffered. One of the signals is a composite IF output while the other is fed to a two-input IF relay switch. When not in use, the composite IF output should be terminated with 75 ohms. F The second input to the relay is normally from the AUX IN input connector. G After IF switching operations, the signal is applied to the IF AGC circuit. The IF AGC circuitry maintains the proper IF input to the upconverter section. This circuit assures that external and internal IF inputs result in the same output level. H The composite IF signal is buffered and filtered to remove any spurious signals and delivered to the IF-to-channel converter system input. I A sample of the composite IF signal (IF TP) is provided at a front panel test point at 14 dBmV. C8M-*-* Installation and Operation Manual System Block Diagrams 5-5 IF to Channel Converter System Figure 5-4 IF to channel converter system IF input 1st mixer A 2nd mixer C D BPF BPF BPF B VCO F G PIN atten Filter bank Output level control Switch driver H Rear panel RF output -20 dB test point E VCO PLL PLL Control data from microprocessor 8 MHz reference Table 5-4 IF to channel converter system Key Description A The IF input signal is applied to the first mixer. B The local oscillator signal for the first mixer is generated by a voltage-controlled oscillator that is PLL controlled. The PLL frequency is programmed by the microprocessor to accommodate the selected channel plan or frequency setting. C The local oscillator mixes with the IF input to produce the high IF which is then bandpass filtered and amplified. D The high IF is applied to the second mixer. E The circuit for the second local oscillator must be tunable over a 550 MHz range to produce RF output picture carrier frequencies. The microprocessor programs the second LO PLL according to the channel or frequency setting. F The channel frequency output signal from the second mixer is applied to a variable loss PIN attenuator. The circuit’s loss is controlled by the RF output level entry on the Main menu. This permits trimming of the combined headend system carrier level for each channel. G The signal is applied to the output bandpass filter bank. The appropriate filter is selected based on the selected channel number. The filter system minimizes the broadband output noise and allows unlimited broadband combining without need for external filters. The RF output signal is supplied to the rear panel, while a sample at 20 dB below actual is brought to a front panel connector for monitoring the final output signal. H The RF signal is amplified by a wideband low distortion amplifier module to provide the 60 dBmV specified picture carrier output level. C8M-*-* Installation and Operation Manual Appendix A Specifications RF Channels Tunable by HRC, IRC, or EIA frequency plans: Frequency tunable in 12.5 kHz steps Frequency range 50 to 600 MHz (C8M-L) 550 to 1000 MHz (C8M-H) Output level +60 dBmV minimum Recommended operating range +57 to +61 dBmV Spurious <-63 dBc for intermodulation products (49 to 1000 MHz) <-72 dBc for fixed frequency products (49 to 1000 MHz) measured relative to analog picture carrier @+60 dBmV RF output and sound carrier@-15dBc Output return loss 14 dB minimum within channel Sound carrier level (adjustable) –10 to –20 dB relative to video carrier C/N ratio (normalized to 4 MHz) In-band 70.0 dB minimum, 72.0 dB typical Adjacent channels 72.0 dB minimum, 75.0 dB typical Semi-adjacent channels 74.0 dB minimum, 77.0 dB typical Other channels 76.0 dB minimum, 79.0 dB typical RF carrier phase noise @1 kHz offset -71 dBc/Hz minimum @10 kHz offset -99 dBc/Hz minimum @20 kHz offset -105 dBc/Hz minimum RF test point -20 dB ±1 dB Group delay 25 ns p-p maximum within a channel (upconverter) Incidental FM (±120 Hz) -30 dBc minimum Phase-lock input (6.0000 or 6.0003 MHz) Return loss 18 dB minimum Input level 0 to +30 dBmV IF Input frequency 41.0 to 47.0 MHz IF input levels +25 dBmV to +35 dBmV IF input return loss 18 dB minimum, 41.0 to 47.0 MHz IF isolation 70 dBc minimum, AUX and PGM inputs @ +30 dBmV IF test point level 14 dBmV nominal C8M-*-* Installation and Operation Manual A-2 Specifications IF test point return loss 16 dB minimum IF AGC range ±5 dB minimum (RF output: ±0.5 dB) CW IF output frequency 45.75 MHz CW IF output level +53 dBmV ±3 dB CW IF phase noise @ 1 kHz offset -86 dBc/Hz minimum Picture IF output frequency 45.75 MHz Picture IF output level +35 dBmV ±1 dB Sound IF output frequency 41.25 MHz Sound IF output level +15 to +25 dBmV Composite IF output level +40 dBmV ±1 dB (picture carrier) Video Video inputs 2 baseband video inputs 1 video loop-thru 1 composite (video + audio subcarrier) input Standard baseband input 0.5 to 2.0 Vp-p for 87.5% modulation Encoded video input level 1.0 Vp-p for 87.5% modulation Video input Impedance 75 ohms Video input return loss 30 dB minimum K factor 2% maximum S/N ratio (lum. weighted) 65 dB minimum Chroma delay, relative to standard precorrection (-170 ns) ±50 ns maximum Frequency response ±0.5 dB from 25 Hz to 4.2 MHz Differential gain 1.5% p-p maximum @ 87.5% modulation Differential phase 1.0 degree p-p maximum @ 87.5% modulation Line time distortion 1% maximum Video AGC Input level range 0.5 to 2.0 Vp-p AGC accuracy 87.5% ±2.5% Composite video input Frequency response ±0.6 dB from 25 Hz to 4.2 MHz Chroma delay ±65 ns K factor 2.5% maximum Audio Input level range Low –10 to +10 dBm, Z0 = 600 ohm High +5 to +25 dBm, Z0 = 600 ohm C8M-*-* Installation and Operation Manual Specifications A-3 Input impedance Low 600 ohms balanced High >15 kohms Frequency response ±1.0 dB from 30 Hz to 15 kHz Signal to noise ratio 65 dB minimum Preemphasis 75 µs, defeatable Harmonic Distortion 1% maximum @ 1 kHz input @±25 kHz deviation Hum and Noise –65 dBc maximum @ ±25 kHz deviation Aural subcarrier frequency 4.5 MHz ±500 Hz Aural subcarrier input level range +35 to 45 dBmV, Z0 = 75 Ohm Aural subcarrier output level +34 ±3 dBmV Aural subcarrier return loss 16 dB minimum Aural subcarrier test point +20 ±3 dBmV Wideband audio input ± 0.5 dB, 30Hz to 50 kHz Audio AGC Compression ratio 4:1 Peak-to-average ratio settings 6 dB, 9 dB, 12 dB, 15 dB (front panel adjustable) Gain hold function Activated by abrupt >15 dB decrease in input Limiter function 0 dBm, follows gain control Time constants 1 s attack, 10 s decay typical Range -10 to +10 dBm peak Remote Control Input connector RJ-12 modular Output (daisy chain) connector RJ-12 modular, daisy chain up to 256 devices maximum (C8*, C6*, Omnistar) Communications control Through Headend Control Software (HCS) or NETsentry network management General ac voltage requirements 100 to 240 Vrms, 47 to 63 Hz Power requirements 45 watts maximum Operating temperature 0 to 50° C Weight 14.5 lbs (6.12 kgs) maximum Dimensions 19” W x 1.75” H x 18” D (48.2 cm x 4.4 cm x 45.7 cm) C8M-*-* Installation and Operation Manual A-4 Specifications BTSC-SE-C8M (Order Commander 8 Modulator with stereo encoder as C8M-*-SX) The Stereo Encoder option for the C8M-*-* is a high performance, digital signal-processing (DSP) unit providing superior BTSC stereo performance per the OET-60 standard. Frequency range 50 Hz to 14 kHz ±1.0 dB Stereo separation 26 dB, 50 Hz to 200 Hz 30 dB, 200 Hz to 10 kHz 26 dB, 10 kHz to 14.5 kHz Harmonic distortion 1% maximum @ 1 kHz input Signal to noise ratio 65 dB minimum Pilot injection 5.0 ±0.3 kHz locked to video at 1H BTSC-SAP-C8M (Order Commander 8 Modulator with stereo/SAP encoder as C8M-*-BX) The SAP option enables broadcast of bilingual or other SAP. You must use this option in conjunction with the Stereo Encoder option. Frequency range 50 Hz to 14 kHz ±1.0 dB Harmonic distortion 1% maximum @ 1 kHz input Signal to noise ratio 65 dB minimum Carrier injection 10 kHz locked to video at 5H C8-DC (Order Commander 8 Modulator with DC option as C8M-*-XD) The dc power option for the Commander headend products enables powering from a dc source instead of from an ac line source. Input voltage -20 Vdc to –60 Vdc (-24 Vdc or –48 Vdc recommended) Input power 45 Watts maximum C8M-*-* Installation and Operation Manual Appendix B Frequency Plan Picture Carrier Frequency (MHz) EIA Channel Designation EIA HRC IRC 1 undesignated 72.0036 73.2625 2 55.2500 54.0027 55.2625 3 61.2500 60.0030 61.2625 4 67.2500 66.0033 67.2625 5 77.2500 78.0039 79.2625 6 83.2500 84.0042 85.2625 7 175.2500 174.0087 175.2625 8 181.2500 180.0090 181.2625 9 187.2500 186.0093 187.2625 10 193.2500 192.0096 193.2625 11 199.2500 198.0099 199.2625 12 205.2500 204.0102 205.2625 13 211.2500 210.0105 211.2625 14 121.2625 120.0060 121.2625 15 127.2625 126.0063 127.2625 16 133.2625 132.0066 133.2625 17 139.2500 138.0069 139.2625 18 145.2500 144.0072 145.2625 19 151.2500 150.0075 151.2625 20 157.2500 156.0078 157.2625 21 163.2500 162.0081 163.2625 22 169.2500 168.0084 169.2625 23 217.2500 216.0108 217.2625 24 223.2500 222.0111 223.2625 25 229.2625 228.0114 229.2625 26 235.2625 234.0117 235.2625 27 241.2625 240.0120 241.2625 C8M-*-* Installation and Operation Manual B-2 Frequency Plan Picture Carrier Frequency (MHz) EIA Channel Designation EIA HRC IRC 28 247.2625 246.0123 247.2625 29 253.2625 252.0126 253.2625 30 259.2625 258.0129 259.2625 31 265.2625 264.0132 265.2625 32 271.2625 270.0135 271.2625 33 277.2625 276.0138 277.2625 34 283.2625 282.0141 283.2625 35 289.2625 288.0144 289.2625 36 295.2625 294.0147 295.2625 37 301.2625 300.0150 301.2625 38 307.2625 306.0153 307.2625 39 313.2625 312.0156 313.2625 40 319.2625 318.0159 319.2625 41 325.2625 324.0162 325.2625 42 331.2750 330.0165 331.2750 43 337.2625 336.0168 337.2625 44 343.2625 342.0171 343.2625 45 349.2625 348.0174 349.2625 46 355.2625 354.0177 355.2625 47 361.2625 360.0180 361.2625 48 367.2625 366.0183 367.2625 49 373.2625 372.0186 373.2625 50 379.2625 378.0189 379.2625 51 385.2625 384.0192 385.2625 52 391.2625 390.0195 391.2625 53 397.2625 396.0198 397.2625 54 403.2500 402.0201 403.2625 55 409.2500 408.0204 409.2625 56 415.2500 414.0207 415.2625 57 421.2500 420.0210 421.2625 58 427.2500 426.0213 427.2625 59 433.2500 432.0216 433.2625 C8M-*-* Installation and Operation Manual Frequency Plan B-3 Picture Carrier Frequency (MHz) EIA Channel Designation EIA HRC IRC 60 439.2500 438.0219 439.2625 61 445.2500 444.0222 445.2625 62 451.2500 450.0225 451.2625 63 457.2500 456.0228 457.2625 64 463.2500 462.0231 463.2625 65 469.2500 468.0234 469.2625 66 475.2500 474.0237 475.2625 67 481.2500 480.0240 481.2625 68 487.2500 486.0243 487.2625 69 493.2500 492.0246 493.2625 70 499.2500 498.0249 499.2625 71 505.2500 504.0252 505.2625 72 511.2500 510.0255 511.2625 73 517.2500 516.0258 517.2625 74 523.2500 522.0261 523.2625 75 529.2500 528.0264 529.2625 76 535.2500 534.0267 535.2625 77 541.2500 540.0270 541.2625 78 547.2500 546.0273 547.2625 79 553.2500 552.0276 553.2625 80 559.2500 558.0279 559.2625 81 565.2500 564.0282 565.2625 82 571.2500 570.0285 571.2625 83 577.2500 576.0288 577.2625 84 583.2500 582.0291 583.2625 85 589.2500 588.0294 589.2625 86 595.2500 594.0297 595.2625 87 601.2500 600.0300 601.2625 88 607.2500 606.0303 607.2625 89 613.2500 612.0306 613.2625 90 619.2500 618.0309 619.2625 C8M-*-* Installation and Operation Manual B-4 Frequency Plan Picture Carrier Frequency (MHz) EIA Channel Designation EIA HRC IRC 91 625.2500 624.0312 625.2625 92 631.2500 630.0315 631.2625 93 637.2500 636.0318 637.2625 94 643.2500 642.0321 643.2625 95 91.2500 90.0045 91.2625 96 97.2500 96.0048 97.2625 97 103.2500 102.0051 103.2625 98 109.2750 108.0250 109.2750 99 115.2750 114.0250 115.2750 100 649.2500 648.0324 649.2625 101 655.2500 654.0327 655.2625 102 661.2500 660.0330 661.2625 103 667.2500 666.0333 667.2625 104 673.2500 672.0336 673.2625 105 679.2500 678.0339 679.2625 106 685.2500 684.0342 685.2625 107 691.2500 690.0345 691.2625 108 697.2500 696.0348 697.2625 109 703.2500 702.0351 703.2625 110 709.2500 708.0354 709.2625 111 715.2500 714.0357 715.2625 112 721.2500 720.0360 721.2625 113 727.2500 726.0363 727.2625 114 733.2500 732.0366 733.2625 115 739.2500 738.0369 739.2625 116 745.2500 744.0372 745.2625 117 751.2500 750.0375 751.2625 118 757.2500 756.0378 757.2625 119 763.2500 762.0381 763.2625 120 769.2500 768.0384 769.2625 C8M-*-* Installation and Operation Manual Frequency Plan B-5 Picture Carrier Frequency (MHz) EIA Channel Designation EIA HRC IRC 121 775.2500 774.0387 775.2625 122 781.2500 780.0390 781.2625 123 787.2500 786.0393 787.2625 124 793.2500 792.0396 793.2625 125 799.2500 798.0399 799.2625 126 805.2500 804.0402 805.2625 127 811.2500 810.0405 811.2625 128 817.2500 816.0408 817.2625 129 823.2500 822.0411 823.2625 130 829.2500 828.0414 829.2625 131 835.2500 834.0417 835.2625 132 841.2500 840.0420 841.2625 133 847.2500 846.0423 847.2625 134 853.2500 852.0426 853.2625 135 859.2500 858.0429 859.2625 136 865.2500 864.0432 865.2625 137 871.2500 870.0435 871.2625 138 877.2500 876.0438 877.2625 139 883.2500 882.0441 883.2625 140 889.2500 888.0444 889.2625 141 895.2500 894.0447 895.2625 142 901.2500 900.0450 901.2625 143 907.2500 906.0453 907.2625 144 913.2500 912.0456 913.2625 145 919.2500 918.0459 919.2625 146 925.2500 924.0462 925.2625 147 931.2500 930.0465 931.2625 148 937.2500 936.0468 937.2625 149 943.2500 942.0471 943.2625 150 949.2500 948.0474 949.2625 C8M-*-* Installation and Operation Manual B-6 Frequency Plan Picture Carrier Frequency (MHz) EIA Channel Designation EIA HRC IRC 151 955.2500 954.0477 955.2625 152 961.2500 960.0480 961.2625 153 967.2500 966.0483 967.2625 154 973.2500 972.0486 973.2625 155 979.2500 978.0489 979.2625 156 985.2500 984.0492 985.2625 157 991.2500 990.0495 991.2625 158 997.2500 996.0498 997.2625 C8M-*-* Installation and Operation Manual Appendix C Changing a Menu Item The following example illustrates how to change the frequency from 503.2625 to 504.2625. 1 Display the frequency as described in Section 2, “Overview.” The following illustration shows the frequency 503.2625: ENT 2 Press the right-arrow key. In this case, the digit “3” flashes as illustrated below: ENT 3 Press the up-arrow key. The digit “4” displays and flashes as illustrated below: ENT 4 If this is the change you want, press ENT to implement the change: ENT 5 If you decide not to make the change, do not press ENT. The frequency returns to the previous value after a short delay: ENT C8M-*-* Installation and Operation Manual C-2 6 Changing a Menu Item To return to the previous value immediately, press the left-arrow key until the previous value is displayed. In this case, the left-arrow key is pressed three times, as illustrated below: the “ 0” flashes, the “ 5” flashes, and then the previous value is displayed. ENT ENT ENT Menu navigation summary: To reach any item in a menu Press the up or down-arrow key (the menu wraps vertically). To display a submenu Press the right-arrow key. To get out of a submenu Press the left-arrow key. To change a menu item Press the right-arrow key to cause the item to flash. Press the up-or down-arrow key until the preferred value or function is reached. Press ENT to implement the change. Use the left-arrow key to exit the menu. If a change is not made, the value reverts to the previous setting after a short delay. C8M-*-* Installation and Operation Manual Appendix D Signal Priority Chart Start Rear AUX selected Y AUX IF N Rear PGM selected Y PGM IF N Rear video B selected Y Video B Audio B N Y Composite selected Y Composite N N Video B selected Y Video B subcarrier Y Video B subcarrier N Video B/sub selected User selected input AUX Video A Audio A Composite B loop Video B subcarrier AUX IF Video A selected Composite selected B loop selected Video B/sub selected PGM Video B Audio B Video A/ B loop Video A subcarrier PGM IF Video B/sub selected Video B/sub selected Video B/sub selected C8M-*-* Installation and Operation Manual D-2 Signal Priority Chart Composite selected Composite present Go to start Y Composite N Auto B on Y N Auto AUX on Video B present Y Video B Audio B N Y AUX IF N Y N C8M-*-* Installation and Operation Manual PGM IF Composite Signal Priority Chart Video A selected Video A present D-3 Go to start Y Video A Audio A N Auto B on Y N Auto AUX on Video B present Y Video B Audio B N Y AUX IF N Y PGM IF N Y N Composite Video A Audio A C8M-*-* Installation and Operation Manual D-4 Signal Priority Chart Video A/sub selected Video A present Go to start Y Video A subcarrier N Auto B on Y N Auto AUX on Video B present Y Video B Audio B N Y AUX IF N Y PGM IF N Y N C8M-*-* Installation and Operation Manual Composite Video A subcarrier Signal Priority Chart A/B loop selected Video A present Go to start Y N Auto AUX on D-5 Video B present Y A/B loop N Y AUX IF N Y PGM IF N A/B loop C8M-*-* Installation and Operation Manual D-6 Signal Priority Chart Video B selected Video B present Go to start Y Video B Audio B N Auto AUX on Y AUX IF N Y PGM IF N Auto COMP on Y Composite N Y N C8M-*-* Installation and Operation Manual Video A Audio A Video B Audio B Signal Priority Chart Video B/sub selected Video B present D-7 Go to start Y Video B subcarrier N Auto AUX on Y AUX IF N Y PGM IF N Auto COMP on Y Composite N Y N Video A Audio A Video B subcarrier C8M-*-* Installation and Operation Manual D-8 Signal Priority Chart B loop selected Video B present Go to start Y B loop N Auto AUX on Y AUX IF N Y PGM IF N B loop C8M-*-* Installation and Operation Manual 494773-001 3/02 MGBI