A squelch could be thought of as a noise gate
(http://www.rane.com/par-n.htm#noise_gate) that has very fast attack and
release times.

Dave

Jacques Vrey wrote:

> Hi to all
>
> I was wondering, with all you rf fundi's out there, if anyone could
> explain to me how the squelch on two-way radio's works. I would
> suspect that it would be some type of adjustable low pass or bandpass
> filter ??