Wayne, others ... As a career (FCC licensed) two-way radio technician, I can confidently state that the "usual" ... there's no FCC Part 97 rule ... transmitter deviation for CTCSS tones is 400 - 600 Hz. Not all repeater's receivers roll off the tones, and few radios ... any? ... made for the ham radio market roll then off. The higher the tone, the more apparent it can be to the listener. BTW, the CTCSS deviation level is the same for low band, VHF and UHF frequencies, and "standard" voice deviation is 5 KHz.
The recent new FCC Part 95 narrow banding rules have changed this voice deviation to 2.5 KHz. These new regs have made TONS of commercial two-way radios illegal for commercial use and the land fills are bulging ... you can't GIVE the stuff away... as most scrap metal buyers don't want the liability that comes with today's electronic scrap. There are no FCC rules preventing use of this equipment on the amateur bands. CTCSS = Continuous Tone Coded Squelch System. "PL", "CG", "QC", etc are patented manufacturer's names for their products, but all are the same. Motorola's "PL" has just become the "Kleenex" of the two-way radio industry. (:-) 73! Ken Kopp - K0PP Montana VHF/UHF Frequency Coordinator [email protected] or [email protected] On Sat, Sep 6, 2014 at 10:36 AM, Wayne Burdick [email protected] [KX3] < [email protected]> wrote: > > > Hi all, > > There seems to be some debate about how much FM deviation is required for > PL tones used to activate repeaters. There's a wide range of deviation > values in use by transmitters, and various "standard" recommendations. The > question is how much is needed for reliable operation in the real world. > __._,_.___ > ------------------------------ > > ------------------------------ > > <[email protected]?subject=Re%3A%20Experiment%3A%20how%20much%20PL%20tone%20deviation%20is%20required%20to%20reliably%20key%20repeaters%3F> > > <[email protected]?subject=Re%3A%20Experiment%3A%20how%20much%20PL%20tone%20deviation%20is%20required%20to%20reliably%20key%20repeaters%3F> > > > - > - > > > . > > __,_._,___ > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
