[Elecraft] CTCSS tone deviation required to reliably key repeaters?

[Ken G Kopp]

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
k0pp at arrl.net
or
kengkopp at gmail.com




On Sat, Sep 6, 2014 at 10:36 AM, Wayne Burdick n6kr at elecraft.com [KX3] <
KX3 at yahoogroups.com> 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.
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>
> <KX3 at yahoogroups.com?subject=Re%3A%20Experiment%3A%20how%20much%20PL%20tone%20deviation%20is%20required%20to%20reliably%20key%20repeaters%3F>
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