Transcript
Avtech Corporation 3400 Wallingford Ave. North Seattle, WA 98103-9041 www.avtcorp.com Tel (206) 695-8000 Fax (206) 695-8011
N1304B-1 SELCAL ENCODER OPERATOR’S MANUAL
SELCAL ENCODER
AVTECH PART NUMBER N1304B-1
OPERATION AND MAINTENANCE MANUAL
PROPRIETARY RIGHTS NOTICE THIS DATA IS PROPRIETARY TO AVTECH CORPORATION. DISCLOSURE, REPRODUCTION, OR USE OF THIS DATA FOR ANY PURPOSE IS NOT AUTHORIZED WITHOUT WRITTEN PERMISSION FROM AVTECH CORPORATION.
3400 Wallingford Avenue North Seattle, Washington USA 98103-9095 Phone (206) 695-8000 FAX (206) 695-8011
23-20-25
Page TP-1/TP-2 Jun 2/06
COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER RECORD OF REVISIONS Rev No
Issue Date
Date Inserted
23-20-25
By
Page RR-1/RR-2 Jun 2/06
COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER LIST OF SERVICE BULLETINS Service Bulletin Number
Date Issued
Description
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER LIST OF EFFECTIVE PAGES SECTION
PAGE
DATE
TITLE PAGE
TP-1 TP-2
Jun 2/06 BLANK
RECORD OF REVISIONS
RR-1 RR-2
Jun 2/06 BLANK
LIST OF SERVICE BULLETINS
SB-1 SB-2
Jun 2/06 BLANK
LIST OF EFFECTIVE PAGES
LEP-1 LEP-2
Jun 2/06 BLANK
TABLE OF CONTENTS
TC-1 TC-2
Jun 2/06 Jun 2/06
LIST OF FIGURES
LF-1 LF-2
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LIST OF TABLES
LT-1 LT-2
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INTRODUCTION
I-1 I-2 I-3 I-4
Jun 2/06 Jun 2/06 Jun 2/06 BLANK
DESCRIPTION AND OPERATION
101 102 103 104 105 106 107 108 109 110 111 112
Jun 2/06 Jun 2/06 Jun 2/06 BLANK Jun 2/06 Jun 2/06 Jun 2/06 Jun 2/06 Jun 2/06 Jun 2/06 Jun 2/06 Jun 2/06
TESTING AND FAULT ISOLATION
113 114 115 116
Jun 2/06 Jun 2/06 Jun 2/06 BLANK
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER TABLE OF CONTENTS SECTION
PAGE
TITLE PAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TP-1 RECORD OF REVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RR-1 LIST OF SERVICE BULLETINS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SB-1 LIST OF EFFECTIVE PAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LEP-1 TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TC-1 LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LF-1 LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LT-1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. High Voltage Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. Electrostatic Discharge (ESD) Sensitive Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I-1 I-1 I-2 I-2
DESCRIPTION AND OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. Equipment Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. Indicators and User Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. Indicators and Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1) Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (2) Code Send Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B. User Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1) Code Entry Pushbuttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (2) Code Send Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (3) Cancel Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. Coding and Tone Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. External Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B. Tone Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C. Transmitter Control Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D. RS-232 Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E. Installation Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. Remote Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. PC Computer Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B. Remote Control Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. Setup Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. Output Volume Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B. LCD Brightness Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C. LCD Contrast Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
101 101 101 102 105 105 105 105 105 105 105 105 106 108 108 108 108 108 108 110 110 111 112 112 112 112
FUNCTIONAL TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. Functional Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. Necessary Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B. Power Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
113 113 113 113 113
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER TABLE OF CONTENTS SECTION C. D. E. F. G.
PAGE Keyboard Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Output Volume Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 LCD Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Output Relay Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Remote Control Tests (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER LIST OF FIGURES FIGURE INTRO-1 101 102 103 104 105
TITLE
PAGE
N1304B-1 SELCAL Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-3 SELCAL Encoder Outline Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Sample Code Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Installation Wiring Diagram For Radio Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 Installation Wiring Diagram For Radio and Microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 Encoder PC Software Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER LIST OF TABLES TABLE 101 102 103 104
PAGE Equipment Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Code Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Software Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Command Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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102 106 110 111
Page LT-1/LT-2 Jun 2/06
COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER INTRODUCTION 1.
General This manual contains description and operation instructions, shop level cleaning, inspection and testing on the N1340B-1 SELCAL Encoder (Encoder). All weights and measurements in this manual are in English units, with their equivalent metric weight or measure in parenthesis. This manual is written in Simplified English. Simplified English is defined by the Association Europeenne des Constructeurs de Materiel Aerospatial (AECMA, Association of European Builders of Aerospace Material). Simplified English helps manual users who may not speak English as their native language. It also helps manual users who do speak English as their native language by making sure that all writing is clear and that all terms have only one meaning.
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER 2.
High Voltage Warning The Encoder has dangerous voltage potentials. Take applicable precautions whenever you see this symbol.
3.
Electrostatic Discharge (ESD) Sensitive Devices The Encoder has components which electrostatic discharge can damage. We show a caution symbol when one of these components can be damaged during a procedure or test. Use applicable ESD procedures whenever you see one of these or any other ESD precaution symbol.
CAUTION! ESD SENSITIVE DEVICES
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER
N1304B-1 SELCAL Encoder Figure INTRO-1
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER DESCRIPTION AND OPERATION 1.
General Selective calling (SELCAL) is a method of selectively signaling an individual aircraft from a ground control station. Ground to air contact is established by the transmission of a four-tone signal on an existing VHF or HF radio network. The overall system consists of SELCAL ground and airborne equipment used in conjunction with existing radio facilities. The ground equipment provides the tone source and code selecting facilities. The airborne equipment consists of one or more decoder units installed in each associated aircraft to provide automatic listening. Each decoder unit is responsive to a unique 4-tone coded signal. When the correct signal is received, the decoder is activated and the aircraft personnel are alerted by a buzzer or light.
2.
Description The N1304B SELCAL Encoder conforms to the requirements of ARINC 714-6 “MARK-3 AIRBORNE SELCAL SYSTEM”, Part III - Ground Selective Calling Unit. The SELCAL Encoder is housed in a self-contained console, which includes an integral pushbutton keyboard and display. All circuit boards, interconnections, and circuit components are packaged in the console with the keyboard and display. Refer to Figure 101. The Encoder console is designed to be used as a desk-top unit by resting horizontally on four rubber feet or by tilting upward with the aid of a metal bar, which is attached to the bottom of the unit. The console is also designed to be easily rack mounted by using two mounting brackets and hardware which are supplied with each Encoder unit. The Encoder is shipped with the mounting brackets and the tilt stand attached. The user may remove either the tilt stand or the rack mounting hardware if it is not required. If you choose to remove the rack mounting hardware, re-install the four screws in the Encoder. Digital frequency synthesis techniques are used in the Encoder to generate 16 individual tones in the frequency range of 312.6 Hz to 1479 Hz. By using various combinations of the 16 tones, 10,920 unique coded signals can be derived. Synthesizer frequency stability is achieved using a crystalcontrolled time base. Other standard features incorporated into the SELCAL Encoder console are: • • • • • • • • •
Highly visible LCD Display 16 pushbutton front panel code entry with key click feedback. Convenient front panel access to code SEND and code CANCEL pushbuttons Code send indicator Self Test Capability 120V/240V 50-60Hz internal power supply Computer Interface via a RS-232 connection. Software module which can externally generate codes and transfer them to the Encoder. Auxiliary relay for keying or audio switching.
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER 3.
Equipment Specifications Table 101 gives specifications for the Encoder. Equipment Specifications Table 101 Item
Specifications
Tone Capacity:
16
Tone Accuracy/Stability:
+0.15% of nominal tone frequency from 0 to +50C
Tone Balance:
+0.5dB over entire frequency range
Code Readout (Display)
Four characters, each approx. 0.5" high
Maximum Audio Output:
+10dBm into 600 ohm load (~7vp-p)
Hum and Noise Level:
Less than -38 dBm at output
Power Input:
Nominal: 120 VAC or 240 VAC, 50-60 Hz Range: 100-120 VAC or 200-240 VAC, 47-63 Hz
Power Drain:
20 W maximum
Code Entry:
16 button keypad or software control
Mounting
Desk top with tilt stand or 19" equipment rack
Dimensions:
1U, 19" rack mount chassis, 10.25" deep max
Weight:
7.5 lbs max.
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER
SELCAL Encoder Outline Dimensions Figure 101
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER 4.
Indicators and User Controls A.
Indicators and Displays (1)
Display A LCD display which shows up to four codes (A, B, C, D, etc.). LCD is backlit for nighttime operation in a low light area. Once a new code is entered following a previous 4 character code, only the new code is displayed. The letters are displayed from right to left as they are entered.
(2)
Code Send Indication The LCD display shows “SENDING” during code transmission.
B.
User Controls (1)
Code Entry Pushbuttons There are 16 code entry keys and are labeled A through S. The keys have tactile feedback.
(2)
Code Send Switch A Code Send switch allows code transmission only after a valid four character code is entered.
(3)
Cancel Switch The Cancel switch will interrupt a code transmission and clear the display when pressed.
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER 5.
Coding and Tone Frequencies The SELCAL console coding scheme consists of four tones transmitted in two groups of two tones (similar to a touch-tone phone). Each set of two tones is transmitted simultaneously. Each transmitted tone is represented by a code letter. The code letters and frequencies are shown in the following table. Code Frequencies Table 102 Code Letter
Frequency (Hz)
A
312.6
B
346.7
C
384.6
D
426.6
E
473.2
F
524.8
G
582.1
H
645.7
J
716.1
K
794.3
L
881.0
M
977.2
P
1083.9
Q
1202.3
R
1333.5
S
1479.1
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER Each aircraft is assigned a unique four digit code. When the ground station (equipped with SELCAL encoding equipment) wishes to call a specific aircraft, this code is entered into the SELCAL Encoder and transmitted. The transmitted signal has a duration of approximately 2.2 seconds, with each tone burst lasting 1.0 + 0.25 seconds separated by an interval of 0.2 + 0.1 second. For example, If the code selected is ABCD; tones A and B are the first tone burst. Tones C and D are the second tone burst. Refer to the following figure for a representation of the four tone burst.
Sample Code Diagram Figure 102
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER 6.
External Connections A.
Power Input The N1304B-1 uses an IEC C-13 style power module that accepts both 120 Vac and 240 Vac 50-60 Hz power. A NEMA 5-15 style power cord is provided with each unit. The user must provide a 240 Vac power cord, if necessary, that is compatible with local requirements.
B.
Tone Output Two screw terminals (Audio Hi and Lo) provide termination points for the Encoder’s tone output and tie-point connection for the transmitter’s audio tone input. The Encoder can be connected to a high or low impedance load. The audio output can also be connected to a biased microphone input.
C.
Transmitter Control Lines There are two sets of screw-type relay contact terminals on the rear panel. These terminals are used for connecting transmitter keying or audio switching lines. The relay operates during code transmission, as shown when “SENDING” is displayed on the LCD.
D.
RS-232 Interface An RS-232 interface is provided to control all aspects of the Encoder using an external PC. Users can create their own programs to interface with the Encoder. Refer to paragraph 7.B for the command instructions.
E.
Installation Wiring Figures 103 and 104 show installation wiring diagrams for two types of uses, either connecting the Encoder directly to a radio or to a radio and microphone combination.
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER
Installation Wiring Diagram For Radio Only Figure 103
Installation Wiring Diagram For Radio and Microphone Figure 104
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER 7.
Remote Control The Encoder can be remotely controlled via the RS-232 interface. A command set can access all of the Encoder’s functionality. Figure 105 shows a typical PC user interface module. All the features standard with the normal actions are available through a software module.
Encoder PC Software Interface Figure 105
A.
PC Computer Requirements The following system hardware and software configuration is recommended. (1)
System Hardware • • • •
(2)
Windows XP or later operating system hardware that will support Windows XP color monitor 1 MB minimum available hard disk space
Software Configuration Available RS-232 Serial Com Port (1 through 4) in standard configuration as shown in the following table. Software Configuration Table 103 COM
IRQ
I/O Port (Hex)
1
4
3F8
2
3
2F8
3
4
3E8
4
3
2E8
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER B.
Remote Control Commands Use the following information to make a command set. (1)
RS-232C Interface Requirements • • • •
(2)
9600 Baud 8-bit data 1 stop bit no parity
Command Set Data The following table shows the Command Set data. Command Set Table 104 ASCII
Command
ASCII
Command
A
A
K
K
B
B
L
L
C
C
M
M
D
D
P
P
E
E
Q
Q
F
F
R
R
G
G
S
S
H
H
T
SEND
J
J
U
CANCEL
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER 8.
Setup Mode The user may adjust the output volume and the brightness and contrast of the LCD display. A.
Output Volume Adjustment Set the Encoder power switch to the on position and press the CANCEL button within 2 seconds. This places the Encoder in the Setup Mode. Press the letter A button on the keypad again and again to increase the output volume. Press the letter J button to decrease the output volume.
B.
LCD Brightness Adjustment Set the Encoder power switch to the on position and press the CANCEL button within 2 seconds. This places the Encoder in the Setup Mode. Press the letter B button on the keypad again and again to increase the brightness of the LCD display. Press the letter K button to decrease the brightness.
C.
LCD Contrast Adjustment Set the Encoder power switch to the on position and press the CANCEL button within 2 seconds. This places the Encoder in the Setup Mode. Press the letter C button on the keypad again and again to increase the contrast of the LCD display. Press the letter L button to decrease the contrast.
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER FUNCTIONAL TEST 1.
General The information in this section helps you test the SELCAL Encoder (Encoder) to determine that the unit is functioning correctly. The Encoder was calibrated at the factory and does not require further calibration. If the Encoder is not functioning correctly, return it to Avtech for repair. CAUTION:
USE ALL APPLICABLE ESD PRECAUTIONS WHEN YOU HANDLE OR WORK ON THE Encoder.
CAUTION! ESD SENSITIVE DEVICES
CAUTION:
2.
ALWAYS REMOVE POWER FROM THE Encoder BEFORE YOU REMOVE OR CONNECT A CABLE OR PCB ASSEMBLY. THIS WILL HELP PREVENT CIRCUIT DAMAGE.
Functional Test Procedure This is the Functional Test Procedure for the Encoder. A.
Necessary Equipment A standard oscilloscope that can measure from < 20 mVpp to > 7.0 Vpp is necessary to do the functional test procedure.
B.
Power Test Set the Encoder power switch to the on position. The LCD must show the Avtech logo for a short period of time, then text “Enter Aircraft Code” must be on the display.
C.
Keyboard Test (1)
Use the keypad on the encoder to enter the code ABCD. The display must show: ABCD Send or Cancel
(2)
Press CANCEL. Only the text “Enter Aircraft Code” must be on the display.
(3)
Enter the code EFGH. The display must show: EFGH Send or Cancel
(4)
Press the SEND button on the Encoder. The display must show “Sending” for 2 seconds then: EFGH Send or Enter Aircraft Code
(5)
Enter the code JKLM. The display must show: JKLM Send or Cancel
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER
D.
E.
F.
(6)
Press CANCEL. Only the text “Enter Aircraft Code” must be on the display.
(7)
Enter the code PQRS. The display must show: PQRS Send or Cancel
(8)
Set the Encoder power switch to the off position.
Output Volume Test (1)
Connect an oscilloscope to the audio output on the terminal strip on the rear of the Encoder.
(2)
Set the Encoder power switch to the on position and press the CANCEL button within 2 seconds. This places the Encoder in the Setup Mode.
(3)
Press the A button on the keypad again and again until the output increases to 25. The oscilloscope must show >7.0 Vpp.
(4)
Press the J button again and again until the output decreases to 1. The oscilloscope must show < 50 mVpp.
LCD Display Test (1)
Press the K button to decrease the LCD brightness to 1. The display must be dim.
(2)
Press the B button to increase the LCD brightness to 8. The display must be bright.
(3)
Press the L button to decrease the LCD contrast to 1. The display contrast must be low.
(4)
Press the C button to increase the LCD contrast to 8. The display contrast must be high.
(5)
Press the L button to decrease the LCD contrast to 6.
Output Relay Tests (1)
Set the Encoder power switch to the on position.
(2)
When the display shows “Enter Aircraft Code”, use the DMM to measure the resistance between RELAY_1 COM and RELAY_1 NO. The resistance must be > 1M Ohm.
(3)
Measure the resistance between RELAY_1 COM and RELAY_1 NC. The resistance must be < 10 Ohms.
(4)
Measure the resistance between RELAY_2 COM and RELAY_2 NO. The resistance must be > 1M Ohm.
(5)
Measure the resistance between RELAY_2 COM and RELAY_2 NC. The resistance must be < 10 Ohms.
(6)
Set the Encoder power switch to the off position. Then, set the switch to the on position and press the CANCEL button within 2 seconds.
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COMPONENT MAINTENANCE MANUAL N1304B-1 SELCAL ENCODER
G.
(7)
Measure the resistance between RELAY_1 COM and RELAY_1 NO. The resistance must be < 10 Ohm.
(8)
Measure the resistance between RELAY_1 COM and RELAY_1 NC. The resistance must be > 1M Ohms.
(9)
Measure the resistance between RELAY_2 COM and RELAY_2 NO. The resistance must be < 10 Ohm.
(10)
Measure the resistance between RELAY_2 COM and RELAY_2 NC. The resistance must be > 1M Ohms.
Remote Control Tests (Optional) (1)
Connect the serial port of a personal computer (PC) to the RS-232 Remote Control Port of the Encoder. Start the SELCAL Remote Control application.
(2)
Use the computer mouse (not the computer keyboard) to select ABCD on the computer monitor. The LCD display on the Encoder must show: ABCD Send or Cancel
(3)
Use the mouse to select SEND on the computer monitor. The LCD display on the Encoder must show “Sending” for 2 seconds, then: ABCD Send or Aircraft Code
This is the end of the Functional Tests.
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