[Premium-Rx] Simple clean audio squelch

[w8au at sssnet.com]

At 11:57 AM 3/29/06, Brooke Clarke wrote:

>Some years ago I wanted to monitor the military HF frequencies and had the 
>exact problem.  The solution was to build an audio based squelch circuit 
>based on a magazine article.  This book sized solid state unit was placed 
>between the radio and a speaker.

Those wanting a fast cheap audio squelch might get a TenTec "Smart Squelch" 
kit.  It is designed to integrate a few seconds of signal above the ambient 
noise level and then "open" the speaker.

Changing the timing capacitor from 1 mfd to .1 mfd (or .01 - not sure since 
it's been awhile) makes it a fast acting audio squelch so that no 
information is lost.

Yes, susceptible to static crashes, etc, but for 95% of the time it's 
super, and I have them tacked onto my WJ-8718's and TenTec SP-325's.

These kits can be seen at http://radio.tentec.com/kits/Fun

Regards,

Perry  w8au