NOISE SQUELCH
Transmitters and Receivers Glossary
Transmitters and Receivers — Noise Squelch
Information on Noise Squelch
Noise squelch uses the presence or absence of noise at the input of the receiver to disable the audio amplifier. When no signal is present at the input, the output noise is high due to the high amplification by the AGC. When a carrier or modulated carrier is present, the noise voltage at the AF amplifier is reduced. We can therefore use the voltage level at (say) 7 kHz to turn a relay off and on, which would allow the AF amplifier to amplify only the wanted signal. The control can be used to preset the voltage level that will be used to trigger the squelch circuit. The operator can use the control to avoid being annoyed by noise when no signal is present.
Other topics in our resources on Transmitters and Receivers related to Noise Squelch include:
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