At 6/2/2004 11:37 PM, you wrote:
> >
> > 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.
Joe:
Have you ever measured the short squelch tail length of your circuit? I
think the Micor squelch is around 2-3 milliseconds, while the Mastr
II/modified MVP short squelch measures around 6 milliseconds.
I believe the SQ-1000 is spec'd for 20 milliseconds release time with a
full quieting signal, which is too long IMO (I can hear a noise burst of
that length, as opposed to the elegant "click" sound of the short Micor or
Mastr II squelch).
Bob NO6B
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