The frequency stamped on the tone has nothing to do
with the tolerence range of it. PL tones are stamped
to .1 Hz, but will generally work +- 1% or so, and are
spaced at 3-4% intervals.
This is probably a similiar tolerence, given the fact
that PL and 2 tone come from the same "era" and
started by using the same technology "reeds". I would
guess that +-1% should work fine for seting off a
2tone decoder, maybe even more- for sure the tones
don't have to be "right on" or even within .1% for
reliable operation.
Joe
--- "Bob M." <[EMAIL PROTECTED]> wrote:
> That's pretty much what I figured as well, but maybe
> the tolerance isn't as tight as the freqs are spec'd
> to. They could have done that to throw us off. PL
> tones can be off by close to one cycle and still
> work
> properly, but they're spaced apart by 3-4 cycles, so
> I'd say the tolerance on those is likely +/- 1-2 Hz.
>
> Similar logic on the paging tones would show they're
> spaced 30-60 Hz apart, so the tolerance might still
> be
> 0.5-1% or so, which would be easier to deal with
> than
> under 0.1%. As long as the tones aren't harmonically
> related, even with the tolerance at one end.
>
> Just my $0.02 worth.
>
> Bob M.
> ======
> --- Eric Lemmon <[EMAIL PROTECTED]> wrote:
>
> > Bob,
> >
> > Well, I guess the Rosetta Stone document is not as
> > valuable as I had
> > hoped. I went through it carefully, but found no
> > statement of tone
> > tolerance. However, I can infer from the printed
> > frequencies- which are
> > specified to 1/10 Hz- that the tolerance is +/-
> 0.1
> > Hz or better. That
> > jibes with your assumption of well under one
> > percent.
> >
> > 73, Eric Lemmon WB6FLY
> >
> > "Bob M." wrote:
> >
> > > I think all we wanted to find out was the
> > frequency tolerance. Is that
> > > in the document? The general consensus seemed to
> > be well under 1
> > > percent, just based on the odd frequencies in
> use.
> > >
> > > Bob M.
> > > ======
> > > --- Eric Lemmon <[EMAIL PROTECTED]> wrote:
> > >
> > > > A week ago, there was an exchange of postings
> > > > regarding the
> > > > specifications of the two-tone sequential
> paging
> > > > format. After some
> > > > searching of my Motorola archives, I found a
> > > > document which I believe is
> > > > the "Rosetta Stone" we seek.
> > > >
> > > > It is Motorola Publication 6881103C80,
> entitled
> > > > "Two-Tone Sequential
> > > > Tone Coding." This seven-page document
> includes
> > the
> > > > timing and
> > > > deviation specifications, along with charts
> > listing
> > > > the various code
> > > > plans. It costs about $3 from Motorola Parts.
> > > >
> > > > 73, Eric Lemmon WB6FLY
>
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