>
> Scott Zimmerman and I have been working on an
> analogue replica of the
> Micor Squelch for some time (several years). Since
> the Micor Squelch
> chip is still available we haven't spent any serious
> time perfecting
> it. Some day the Micor Squelch chip will be hard to
> come by, and we'll
> dig out our version of this circuit, perfect it, and
> turn it into a product.
>
> Kevin Custer
I dug out my Micor squelch replicant and started
playing with it a few weeks ago. I had some prototype
boards etched and I built up one to try. Actually, the
AS board on the local 440 machine (a Micor mobile)
died and instead of putting in a mother M replacement,
I shoved mine in there to test it out. I have a built
in audio buffer, just like the original, but no audio
amplification (we don't need speaker audio on our
repeaters).
Anyway, it's been running for about a month now, and I
can't tell it from the real thing. I'm very happy with
how it works on the micor, probably need to get some
out to test on other types of receivers. I put an LED
on it so I can see when the squelch opens, but except
for that it draws less than 10 mA.
I have an onboard open collector transistor, and a
positive going voltage when unsquelched, so it will
work with about any type of controller. It's on a
board about 2 x 2.5 inches, I just screwed it into one
of the holes that previously held the original AS
board.
Anyway, when I get some time (after field day) I'll
probably build the other 5 up, and make them available
for testing on different radios. Would be one more
option for use, if they pan out OK.
Joe
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