At 3/19/2009 13:59, you wrote: >--- In Repeater-Builder@yahoogroups.com, "Bob M." <msf5kg...@...> wrote: > >"... The MSF5000 squelch is a single-level noise-based squelch system, >much like the MaxTrac and most mobile radios. The squelch-tail duration is >fixed. ..." > >............................................................. > >Incorrect. > >Since the original post referred to a CXB station, the operation of the >squelch circuitry in the SSCB is as follows: > >The receiver squelch switching circuit operates in two modes. With a weak >signal just above the opening sensitivity, squelch closing is slow >(approximately 150 ms.) which results in the long squelch tail heard at >the end of a received message. The long squelch tail is present to >prevent the received message from being chopped during a weak fluttering >signal. > >With a strong signal (approximately 10 dB above opening sensitivity), a >squelch closing occurs immediately after the end of a received >signal. This prevents the squelch tail from being heard.
A friend of mine has a stock MSF5000 repeater on the air well within HT range, so I tried sending some strong & weak signals to it. Sure enough, it's noise squelch acts a lot like the Micor, but it's not as good IMO. The MSF5000's short squelch sounds like it's 10 to 20 milliseconds, not as quiet as the Micor's 2 to 4 milliseconds. Bob NO6B
