[Premium-Rx] Fw: HF SQUELCH

[John USA]

Hi Guys,

I realize my memory is indeed foggy---I just found my notes, and, of all the outrageous things to do, I read the directions....hookup is not what I recalled, but all the info is available quite readily.

There's another type of squelch that samples the audio looking for the 300 HZ voice carrier...a specialty all its own.  There's tons of work going on involving voice activity recognition, which is just what one needs for ssb squelch.  Because of up-front analysis time, a short audio buffer is needed to replace what would have been the upcut audio at the beginning of the channel-active status.

I am currently using a bank of HF rx's, each feeding an audio mixer input.  Most premium-rx's are 600 ohm line audio...that mates with a pro mixer fine.  Rx's with hi-fi levels out, a level and impedance converter is needed.  Obviously, Once I've gotten this far I can monitor whatever I want.  But going a few steps further:  I use qty8 broadcast powered speakers, fed by various "send" lines,  send/receive lines are present and are used to route a rx's audio to an expernal processor, decoder, recorder.  Playback and redisplay of any of the audio is simple.  While my Cubic and Watkins Johnson squelches work quite well, external audio noise gates may be useful at times just softening the ocassional static crash or what have you.

again,   Good luck!!

John Collins
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