Back to Cross index   REQUEST PRODUCT INFORMATION!
 

454 Dual Channel Subcarrier System

 
The 454 is a dual channel, standard, synthesized FM subcarrier system for 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 emphasis settings appear on the front panel LCD display. The 454 provides selectable 75 usec or J17 emphasis networks, >75 dB dynamic range, and threshold extension which allows receiving signals under severe fades. Connection to video is via a passive directional coupler which does not load the video signal.
 

Equipment Specifications*
 

System - Audio
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)
None
75usec or J17, selectable
> 75dB from PPL, clean signal
System - Other
Frequency range
Channel spacing (min)
Deviation (at PPL)
Connectors
Power
Size
1.0 to 9.99 MHz in 10kHz steps
600 kHz with ± 250 kHz deviation
± 150kHz to ± 250kHz, 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  
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, Emphasis, Alarm, Off
Demodulator Characteristics
Subcarrier input level
Input Impedance
Audio Impedance
C/No for threshold
Alarm
Indications
20 to 200 mVpp
Bridging (> 4k ohms) to 75 ohm line
600 ohms, balanced transformer coupled
63 dB-Hz
AFC; Carrier below squelch level; Synthesizer out of lock
Frequency, Emphasis, Alarm, Off

*+10 to +40 degrees C; Specifications subject to change without notice