• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

Do you remember the Yaesu FRG-9600?

mancow

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N.E. Kansas
Excellent. I've been meaning to try to duplicate that as small as possible with SMT components for my FT-857. Thanks.
 

prcguy

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Jun 30, 2006
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So Cal - Richardson, TX - Tewksbury, MA
A friend, now SK built one of those in the 80s with the circuit board mask provided for the project. I ended up with it a few years ago and eventually threw it away. I later built a more modern and much smaller one from a kit which works ok and only cost about $25.

It's the circuit published in 73 magazine in August 1982. There's an article on Repeater Builder about it here:

The Jet Propulsion Labs "Smart" Squelch / VOX
 

majoco

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Joined
Dec 25, 2008
Messages
3,252
Location
New Zealand
Codan Australian transceivers have had a 'smart squelch' incorporated since the 70's. Here's a schematic and PC board layout.PCB and info.jpgSchematic 1.jpg
 
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