Transcript
The S450M-II modulator is a full-featured NTSC frequency agile modulator that is designed to economically meet the needs of the cable system operator. All adjustments, of the S-series Frequency Agile Modulator (S450M-II) with the exception of stereo operation, can be made via convenient front panel controls. Output frequency can be selected by dipswitches located behind a sliding cover. Also included in the dipswitch selection is the ability to set the required FCC offsets of either +12.5 kHz or +25 kHz.
The S450M-II modulator is a full-featured NTSC frequency agile modulator that is designed to economically meet the needs of the cable system operator.
Other front panel features include an RF level adjustment control and a -20 dB RF test port. An LED indicates power on/off. The S450M-II can accept either MPX or 4.5 MHz BTSC stereo signals. A simple relocation of internal “suitcase” jumpers allows complete stereo compatibility. External IF loops enable the S450M-II to be compatible with Motorola and other manufacturers’ scrambling systems. Video depth-of-modulation and audio deviation adjustments are made by the controls located next to their associated overmodulation indicators. The LED indicator adjacent to the video control is activated when video modulation exceeds 87.5%. The audio LED indicator lights up when the deviation exceeds 25 kHz. The A/V (audio/ video ratio) control adjusts the level of the aural carrier in relation to the video. This is preset at -15 dB at the factory.
BENEFITS INCLUDE:
• Frequency agile output from 50 to 450 MHz • BTSC stereo compatible • Front panel controls • FCC compliant
RF Output Channels Output Level Spurious Output In-band C/N Out-of-band C/N Frequency Stability Output Return Loss Audio/Video Ratio Picture IF Output Level Sound IF Output Level
2-69 IRC and FCC offsets per rule 76.612, all front panel switchable, sub-channel output (optional) 60 dBmV Min., 10 dB adjustable >60 dB down @ 60 dBmV output, 50 to 450 MHz 64 dB Minimum 80 dB Minimum ±5 kHz (conforms to FCC requirements) >12 dB -12 dB to -25 dB adjustable (preset @ -15 dB) 35 dBmV Nominal 20 dBmV Nominal
Video Input Level Input Type Input Impedance Input Return Loss Differential Gain Differential Phase K Factor Tilt of 60 Hz Square Wave Modulation Range Overall Group Delay Chrominance - Luminance Delay Signal To Noise Flatness
0.7 V p-p min. for 87.5% modulation Composite NTSC, sync negative 75 Ohms >30 dB <5% (0.4 dB) @ 87.5% modulation, APL 10% to 90% <3° @ 87.5% modulation, APL 10% to 90% 4% Maximum 1% Maximum 0 to 100% 75 nsec ±40 ms (80 ms P-P) 60 dB Minimum ±1 dB from 25 Hz to 4.18 MHz
Audio Baseband Input Impedance Baseband Input Level Preemphasis Harmonic Distortion Flatness 4.5 MHz BTSC Stereo Input Level Signal to Noise Audio Subcarrier Frequency
600 Ohms balanced/unbalanced -10 dBm (250 mV) to +10 dBm (2.5V) for ±25 kHz deviation 75 microseconds ±1 dB, 50 Hz to 15 kHz Defeatable by internal jumper for BTSC stereo operation 1.5% Max. @ ±25 kHz deviation, 50 Hz to 15 kHz 2.0 dB Max., 50 Hz to 15 kHz, including preemphasis +35 dBmV to +45 dBmV -50 dB Minimum (@ 1 kHz) 4.5 MHz ±500 Hz
General AC Power Requirements Fuse Weight Rack Mounting Dimensions Overall Dimensions Operating Temperature Range
108 to 132 V, 60 Hz, 15 W 0.5A slo-blo, external 6 lbs (2.72 kgs) 19"W x 1.75"H (single EIA rack unit) (48.07 cm x 4.42 cm) 6"D x 19"W x 1.75"H (15.18 cm x 48.07 cm x 4.42 cm) 32°F to 120°F (0°C to 50°C)
Olson Technology Inc. 24926 Highway 108 Sierra Village, CA 95346 1.800.545.1022 www.olsontech.com
2/25/04 Rev.0
