A true Dual Squelch Circuit? I don't see anyone talking about the "other type of dual squelch circuit". The squelch circuit operation is also all about what you do with the results.
The Micor Chip squelch is a well known circuit with action/operation probably based on voice band energy/information and its detection against other information (or lack there off) and/or noise. That's a fine and dandy for voice audio... but if you examine both the Micor and MSR-2000 Repeater Squelch Module circuits... you will clearly see how the carrier detection circuit (an integrator) is a different animal. The integrator circuit operation is reported to be leagues better for noise detection. So the better beast would be to use a dual circuit like the Motorhead Noise Integrator for your COS/COR logic and the voice band and/or second squelch circuit for the voice audio gate. Hey that's what Motorola does/did in the Micor and the MSR-2000. Don't be confused by a dual fast/slow squelch circuit operation being the same as the integrator. So out of the pipe... what do you do with your squelch circuit output? Drive and gate the cor/cos and audio gate at the same time (most people do...)? Or do you run a true dual squelch circuit with different output logic for cos/cor and audio gate control? Sometimes it's all a mute point if you "hide" or gate your repeater controller receive audio behind an audio delay module. So.... What's in your wallet? cheers, skipp > A PDF file of the schematic has been uploaded to the files page of > Repeater Builder. The link is here: > If the link doesn't work, just go to the file page and download it, > it's called "dual_level_sq.pdf" >
