In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal.
The squelch adjustment sets a threshold for the signals/transmissions that you hear -- it lets you listen to actual transmissions without hearing the dead noise when a frequ … ency is not active. Merge this question into. Split and merge into it. Answer by Chobbs. Confidence votes 34. Squelch is something used in telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. The use of digital squelch on a channel that has existing tone squelch users precludes the use of the 131.8 and 136.5 Hz tones as the digital bit rate is 134.4 bits per second and the decoders set to those two tones will sense an intermittent signal (referred to in the two-way radio field as falsing the decoder). In amateur radio, the terms PL tone, PL and simply tone are still used somewhat commonly. Often, there is a distinction between the terms tone and tone squelch, in which the former refers to the use of transmitting a CTCSS tone while using standard carrier squelch on the receiver. Wireless microphones are designed with squelch circuits to mute audio when the receiver loses or cannot find the transmitter’s signal. Squelch circuits are necessary because receivers (especially analog ones) try and demodulate anything they can, including waves that make up the noise floor and interfering signals. The receiver will squelch when it cannot locate the tone key. A tone key squelch can be fooled by rogue harmonics that approximate the tone key’s frequency or by other nearby microphone transmitters (used by someone other than you) that are also using tone keys. Full Definition of SQUELCH. transitive verb. 1. a: to fall or stamp on so as to crush. 2. : to emit or move with a sucking sound. intransitive verb. 1. : to emit a sucking sound. 2.  Two way radios usually have a feature called squelch. In this episode of Radio 101, we explain what squelch is and what it does. Hosted by Anthony Roque from http://www.buytwowayradios.com.  Familiarity information: SQUELCH used as a noun is rare. • SQUELCH (verb). The verb SQUELCH has 4 senses: 1. suppress or crush completely. 2. make a sucking sound. 3. walk through mud or mire. 4. to compress with violence, out of natural shape or condition. Familiarity information: SQUELCH used as a verb is uncommon.  In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. A carrier squelch is unlocked and will let any signal in. Selective calling locks out all signals except ones with the correct code. In non-critical uses, selective calling can also be used to hide the presence of interfering signals such as receiver-produced intermodulation. A carrier squelch or noise squelch is the most simple variant of all. It operates strictly on the signal strength, such as when a television mutes the audio or blanks the video on empty channels, or when a walkie talkie mutes the audio when no signal is present. In some designs, the squelch threshold is preset. A carrier squelch is unlocked and will let any signal in. Selective calling locks out all signals except ones with the correct code. In non-critical uses, selective calling can also be used to hide the presence of interfering signals such as receiver-produced intermodulation.
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what is squelch