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450 Dual Channel Subcarrier System |
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| The 450 is a dual channel, synthesized FM subcarrier system for narrow band multi-channel applications above a video signal with low distortion and flat frequency response. Frequency from 1 MHz to 9.99 MHz, subcarrier "off", and compandor "in/out" settings appear on the front panel LCD display. The 450's 3:1 compandor provides >85 dB dynamic range and threshold extension allows receiving signals under severe fades. With companding disabled, the 450 is a standard subcarrier system with 75 usec or J17 emphasis networks. Connection to video is via a passive directional coupler which does not load the video signal. | ||
Equipment Specifications*
| System - Audio | |
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Peak
program level (PPL) Frequency Response Distortion Compandor type Emphasis Dynamic Range |
+9 or +18 dBm,
selectable ± 0.25dB from 50Hz to 15kHz <0.2% at 1kHz (De-emph, 30 kHz BW) 3:1 or None, selectable 75usec or J17, selectable > 85dB from PPL |
| 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 280 kHz ± 75kHz, adjustable BNC, female, subcarrier in/out; terminal strip, audio and alarm 115/230 VAC, 47-63Hz, < 30W 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 100 mVpp
(adj.) Bridging (> 4k ohms) to 75 ohm line 600 ohms, balanced transformer coupled or high impedance (>50k) Synthesizer out of lock, Carrier frequency out of lock Frequency, Alarm, Off |
| Demodulator Characteristics | |
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Subcarrier input level Input Impedance Audio Impedance C/No for threshold Alarm Indications |
25 to 250 mVpp
(adj.) Bridging (> 4k ohms) to 75 ohm line 600 ohms, balanced transformer coupled 61 dB-Hz AFC; Carrier below squelch level; Synthesizer out of lock Frequency, Alarm, Off |
*+10 to +40 degrees C; Specifications subject to change without notice