At 4/17/2007 15:00, you wrote: >Re: mc-3357 & mc-3359 squelch circuit > >Many receivers used the two mentioned chips... in both commericial, >Amateur Radio and classic scanner circuits. I've seen both part >numbers converted to "tk" numbers in Yaesu and Uniden Radios. > >There are a number of working squelch circuits using the back end >section of the chip with and without external op amps. While the >Hamtronics circuit is/was rather basic it did work pretty well and >was easy to experiment with changes/mods.
IMO the Hamtronics squelch circuit was the worst I've ever heard. The impulse response problem really caused a lot of subtle performance problems that just don't show up in other squelches. Let's not forget that long Motrac-like squelch tail to boot. In the end, an excellent candidate for a Micor squelch retrofit. Bob NO6B
