On 3/23/2010 6:05 AM, Mike Morris WA6ILQ wrote: > At 01:15 AM 03/23/10, you wrote: >> Hello again. >> >> I have a UHF MSR2000 up and running now. Most of my radios have the >> reverse burst in them. But just about all ham grade radios do >> not. Is there a way to get rid of the squelch crash from the >> repeater when a non commercial grade radio is used? >> >> Repeater is stock, and would like to try and keep it that >> way. Hoping there is maybe a jumper setting or a trick that someone >> might know. >> >> Single PL tone card in the repeater, card number trn073app on back, >> trn5073 on front. >> >> thanks > > Encoding reverse burst ifs a function of the transmitter, > responding to it requires a receiver that has a tone decoder > that is designed to respond to it. Many electronic decoders > never "see" the reverse burst and continue to decode the > phase-delayed tone until it goes away (when the transmitter > PTT drops). An electronic decoder has to be specifically > designed to respond to reverse burst (and almost all of the > current crop are microprocessor based... detecting and > responding to a phase shift is easy to do in software)
<snip> And Mike's answer is perfect if you were referring to squelch 'tail' when the repeater drops. If the problem is the noise when a user with a ham rig drops, then the answer is different. There are mods that can be done to the MSR squelch circuit to make it close quicker. The best idea I've seen (without using an external controller that has an audio delay line in it) is to use a Micor squelch circuit in place of the MSR squelch. It doesn't completely eliminate it, but it make it short enough that there shouldn't be any significant complaints. It should be on the Repeater-Builder web site somewhere... > > Mike WA6ILQ > > PS - have your users pressure the Kenwood, Icom > and Yaesu reps at every hamfest ... have each user > tell the reps in their own words that the factory should > start using the commercial tone encode/decode circuits > and firmware code that they are using in their commercial > radio product lines and have been for years. > It would be nice to get reverse burst, tone, DPL, and split > tones/codes in ham rigs. Boy, ain't that the truth!!!!!
