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[aprssig] Re: PL 100

KC2MMi kc2mmi at verizon.net
Sun Jul 18 20:35:22 UTC 2004


Rodney, I'm sure there must be some reason but I've never heard one given.
"All" the manuals refer to PL tones and CTCSS tones as is they are different
things. They refer to using a PL tone to get into receivers, and using a
CTCSS as a selective squelch tone on your own radio, so you will only hear
callers who are using that same tone. (i.e., "Privacy tones" in FRS radios.)

Funny thing is, they are the same tones, AFAIK only the context is
different. PL refers to using a tone when you transmit, CTCSS refers to
requiring others to use it to open the squelch on your radio (once you've
set that) but I suppose in order to confound newcomers and prevent them from
joining the hobby, all the manuals deal with this as is they were different
tones.

If there really is any difference, I'd sure be glad to learn it.





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