Paul,
the underlying and unexpected contridiction here was not between 15Khz vs.
20Khz channel spacing but instead between 20Khz and 25Khz channels more
commonly found on UHF which as you know is where GMRS resides. Historically
there's more than enough guard between channels to compensate for slight
overdeviation or slight drift off channel but now everybody wants to tighten
things up so new gear is coming stock with 4Khz max dev associated with 20Khz
channels vs. 5Khz dev which we've all enjoyed for years on 25/30Khz channels.
Seems a bit odd of them to expect no interference problems from +/-5Khz peak
dev on a 20Khz max channel but it is better for us users to have the option I
suppose.
Gary
---- Paul Plack <[EMAIL PROTECTED]> wrote:
> Gary, 5 kHz deviation with a 3 kHz audio cutoff creates a signal at least 13
> kHz wide, counting only the first set of sidebands. That's why many states
> went from 15 kHz to a 20 kHz channel bandplan on 2m a few years ago. There's
> nothing inconsistent in the FCC imposing both limits.
>
> 73,
> Paul, AE4KR
>
> _____
>
> From: [email protected]
> [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Thursday, January 24, 2008 1:33 PM
> To: [email protected]
> Subject: Re: [Repeater-Builder] Re: Gmrs Repeater
>
>
>
> I wrote NARROWER GMRS SPECS. I did not write narrowband. After more study I
> see some possible contridictions in the rules as currently written for
> example, F3E/G3E GMRS emissions (probably the most common) are limited to
> 20Khz bandwidth but at the same time those emission types are also limited
> to +/-5Khz peak dev. I suspect the FCC doesn't really give a damn these days
> especially with rebanding, auctions, and now a congressional investigation
> on their doorstep.
> Gary
>
> ---- wd8chl <[EMAIL PROTECTED] <mailto:wd8chl%40gmail.com> com> wrote:
> > [EMAIL PROTECTED] <mailto:n6lrv%40cox.net> wrote:
> > > Good idea Richard especially since Mitreks are wideband radios so making
> them meet the narrower GMRS specs is probably a monumental task. I wonder if
> a Mitrek can even meet the required frequency tolerance.
> > > Gary
> >
> > You're not talking about the Part 90 narrowbanding? Part 95 (GMRS) does
> > not have to narrowband. The 12.5 tertiaries are NB, but the normal
> > channels can stay as they are.
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
>
>
>
>
