SQUELCH

Transmitters and Receivers Glossary

Transmitters and Receivers — Squelch

 

 

 

 

 

 

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Information on Squelch

Squelch is used to disable the audio output of a receiver unless a signal is present.
     Automatic gain control (AGC) assists in turning up the amplification to ensure that the operator hears the output from a very weak radio-frequency (RF) signal at the same volume as a strong signal. One disadvantage of implementing AGC, however, is that when a weak signal disappears and only noise is present, the automatic gain control (AGC) amplifies the low RF level and produce a considerable output noise level when there is no input signal. This noise output annoys the operator of the receiver so a squelch circuit is included in the audio frequency (AF) stage.


Other topics in our resources on Transmitters and Receivers related to Squelch include: 
 
  • noise squelch
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  • internal tone squelch
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  • external tone squelch

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