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[aprssig] Re: PL 100

Daron J. Wilson daron at wilson.org
Sun Jul 18 20:45:58 UTC 2004


The difference is by manufacturer and trade name.  Private Line (PL) is
Motorola's deal for a subaudible tone used to open the speaker on a
receiver.  Other manufacturers called it other things (Quiet Channel,
Channel Guard, etc.) and it is all the same provided we don't look at
the DPL (digital private line) or something like that.

CTCSS (Continuous Tone Controlled Squelch System) a sub audible tone in
the range of 67 to 254 Hz.

Daron J. Wilson, RCDD          ) )
Telecom Manager               ( (
LH Morris Electric, Inc.       ) )
(541) 265-8067 office       _|****|  mmm!
(541) 265-7652 fax         ( |    |  coffee!
(541) 270-5886 cellular     \|    |
daron.wilson at lhmorris.com    |____|
 

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]
> On Behalf Of KC2MMi
> Sent: Sunday, July 18, 2004 1:35 PM
> To: aprssig at lists.tapr.org
> Subject: [aprssig] Re: PL 100
> 
> 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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