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Three - programme broadcasting system "V I K A"

The system of three programme broadcasting is intended for transmitting three independent monophonic audio programmes using standard FM transmitters in the bands 65,8 - 74 MHz or 87,5 - 108 MHz on one carrier frequency. Standard receivers equipped with special decoders receive the three - programme signal.

Specification of the system

  Bandwidth ( = 3ไม):
  I channel, Hz 50-10 000
  II & III channels, Hz 100-10 000
  Harmonic coefficient,% ํๅ แ๎๋ๅๅ 30
  Crosstalk attenuation between channels, dB ํๅ ์ๅํๅๅ 40
  S / N, dB ํๅ ์ๅํๅๅ 60
  Bandwidth of composite signal, KHz 0,05-52
  Maximum carrier frequency deviation, KHz:
  for 65,8-74 MHz 50
  for 87,5 - 108 MHz 75
  Maximum frequency deviation caused
by pilot tone, KHz:
  for 65,8-74 MHz 5
  for 87,5-108 MHz 7,5
  Bandwidth occupied by the transmission
on the air, KHz:
in the limits of standards established for FM stereo broadcasting
  Change of noise properties in comparison
with mono reception, dB
-17
  Change of noise properties in comparison
with stereo reception, dB
+8