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2710, 2779 Subcarrier System |
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| The 27XX (2779-XX for transmitter, 2710-XX for receiver) is a crystal controlled FM subcarrier system for multi-channel applications above a video signal with low distortion, flat frequency response from 50 Hz to 15 kHz, and factory set subcarrier frequencies from 5.4 MHz to 8.5 MHz. Connection to video is via a high impedance resistor which does not load the video signal even when power is lost. | ||
2779-2X Transmitter and 2710-2X Receiver - Dual
2779-0X Transmitter and 2710-0X
Receiver - Single
Equipment Specifications*
| System - Audio | |
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Peak program level (PPL) Frequency Response Distortion Compandor type Emphasis Dynamic Range --- |
0 to +18 dBm,
adjustable ± 0.25dB from 50Hz to 15kHz <0.3% at 1kHz (De-emph, 30 kHz BW) None 75usec, J17 available > 75dB from PPL for >= 75kHz peak deviation, clean signal > 60dB from PPL for <= 75kHz peak deviation, clean signal |
| System - Other | |
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Frequency range Channel spacing (min) Deviation (at PPL) Connectors Power Size |
5.4 to 8.5 MHz,
crystal controlled, factory set approximately 2.4 X (peak deviation + top audio freq) ± 50kHz to ± 325kHz, factory set BNC, female, subcarrier in/out; terminal strip, audio and alarm 115 VAC, 60Hz, < 20W 1.75"H X 19"W X 15"D, each |
| Modulator Characteristics | |
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Subcarrier output level Output Impedance Audio Impedance Alarms Indications |
25 to 250 mVpp
(adj.) Bridging (> 1.5k ohms) to 75 ohm line 600 ohms, balanced (high impedance, > 50k ohms, available) Carrier frequency out of lock Alarm, Peak Modulation |
| Demodulator Characteristics | |
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Subcarrier input level Input Impedance Audio Impedance Alarm Indications |
25 to 250 mVpp
(adj.) Bridging (> 1.5k ohms) to 75 ohm line 600 ohms, balanced (low impedance, 100 ohms, available) Input subcarrier level low Alarm, Audio presence indicator |
*+10 to +40 degrees C; Specifications subject to change without notice