In the first part of our series on in-band signaling, we discussed one of the most common and easily recognizable forms of audio control, familiar to anyone who has dialed a phone in the last fifty ...

Abstract: This paper describes the original VHF mobile radio system in the Indiana and Michigan Electric (I&ME) Company and how it operated with standard squelch. It points out some of the problems ...

Many of the less expensive shortwave receivers have no squelch circuit and continue to emanate noise when no usable signal is coming in. Fortunately, they normally have an LED which lights to indicate ...

Noise is by definition any undesired sound. While an f.m. receiver has less noise on a station than an a.m. receiver, it is noisy between transmissions. In the absence of an incoming signal, a loud ...

This page describes my Superregen VHF AM Airband receiver with Squelch, and provides some background around approaches to solving the problems of designing squelch circuits for superregen receivers.

This voice squelch software was developed by Dr. Warren Pratt, NR0V. I helped a little by analyzing a hardware version of the algorithm in order to provide data for Warren's efforts. Please contact ...