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Products - Products

MODULATORS   FOR  TV-TRANSMITTERS

Modulators are intended for carrier frequency formation and  TV-signal frequency translation (image and sound) to necessary TV- channel frequency.

Modulators are used in TV-transmitters, cable TV systems, MMDS and other systems of TV-signal transmitting. 

Carries out:

  • stabilization of sound and image carrier frequencies by the synthesizers based on the thermos-tatted frequency oscillator;
  • forming of signal with single side band by the SAW filter; 
  • stabilization of output signal level; 
  • indication of video signal absent; 
  • indication of over modulation of audio signal; 
  • high amplitude and frequency linearity of the section; 
  • correction of amplitude non- linearity of power amplifier of the TV-transmitters; 
  • balanced input for audio signal.

 

SPECIFICATIONS

 Image Sound
Frequency range 20...6C106 Hz 20...14C103 Hz 
Modulation type amplitude frequency 

Nominal level of input signal

1V(at Rinp=75 Ohms)

0,75V(at Rinp=600 Ohms)
Input signal levels range 0,5...1,5 V 0,25...1,75 V 
Signal/noise ratio 60 dB 

60 dB

Amplitude frequency characteristics unevenness of  video signal 

±0,2 dB

 

 

Output signal to channel intermodulation products ratio  60 dB
Non-linearity of carrier frequency: 
       -in VHF range  ± 50 Hz
       -in UHFrange  ± 200 Hz
Power supply  (220± 20) V
Operating temperature range  5...450С
HF signal output level at Rloading=50/75 Ohms  0,3...3 V

 read more PDF


 

 
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