[chirp_users] GMRS Channel Locking

Frank S coloradomountainrider at gmail.com
Wed Feb 23 11:21:36 PST 2022


You know guys, it just could be that some brain decided to start at the
lowest frequency and worked their way to the highest.

KD2YEM
Frank

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On Wed, Feb 23, 2022 at 2:08 PM Chris Romp <chrisromp+chirp at gmail.com>
wrote:

> Agreed - I was trying to figure out if the channel/frequency mapping
> is a Part 95E requirement. If it is, I cannot find it. The only place
> I can find a reference with channels is under Part 95B, "FRS
> Channels," but the equivalent (?) regs for GMRS simply state the
> frequencies allowed, which makes sense.  Some links below.
>
> 47 CFR Part 95B §95.563 "FRS Channels" -
>
> https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-95/subpart-B/section-95.563
>
> 47 CFR Part 95E §95.1763 "GMRS Channels" -
>
> https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-95/subpart-E/section-95.1763
>
> Thanks,
> Chris
>
>
> On Wed, Feb 23, 2022 at 10:37 AM Nigel A. Gunn G8IFF/W8IFF
> <nigel at ngunn.net> wrote:
> >
> > OK Chris.
> > In most radios that come pre-programmed by the manufacturer, as opposed
> to the random channels that a manufacturer seems to leave in there after
> testing, I believe they are locked by the firmware in order to comply with
> a country's frequency allocations and get type approval in that country.
> Don't know if the FCC insists on that.
> >
> >
> > > On 23/02/2022 13:27 Chris Romp <chrisromp+chirp at gmail.com> wrote:
> > >
> > >
> > > Hi Nigel,
> > >
> > > In the case of the RB26 that doesn't appear to be true: I have one in
> my hands that's configured for repeater 18 (625) on the radio's channel 1,
> and they seem perfectly happy to radio clone that configuration to other
> units. It may be that other radios do enforce it in the firmware (e.g.
> BTech GMRS V1, though I haven't tested that).
> > >
> > > Jim KC9HI explained that CHIRP is doing this because that's how the
> OEM software behaves in the case of the RB26. I've since pulled down their
> (terrible) software and verified that, and emailed Retevis to ask why (not
> optimistic I'll get a useful response).
> > >
> > >
> > > Thanks,
> > > Chris KN6LEH
> > >
> > >
> > > On Wed, Feb 23, 2022 at 10:16 AM Nigel A. Gunn G8IFF/W8IFF <
> nigel at ngunn.net> wrote:
> > > > Nothing to do with Chirp. The radio's firmware doesn't allow them to
> be changed.
> > > >
> > > >
> > > >  > On 23/02/2022 12:44 Chris Romp <chrisromp+chirp at gmail.com> wrote:
> > > >  >
> > > >  >
> > > >  > Thanks, Jim, for that info. I've reached out to Retevis to see if
> > > >  > they have any input. Would it basically be a requirement for
> CHIRP to
> > > >  > support assigning any GMRS frequency to any channel for Retevis to
> > > >  > change their OEM software, even if the radio supports it?
> > > >  >
> > > >  > Thanks again,
> > > >  > Chris
> > > >  >
> > > >  > > On Mon, Feb 21, 2022 at 6:08 PM Chris Romp <
> chrisromp+chirp at gmail.com> wrote:
> > > >  > > >
> > > >  > > > Hello,
> > > >  > > >
> > > >  > > > I have a question about how CHIRP handles GMRS radios, e.g.
> BTech GMRS V1 and Retevis RB26. I've noticed that CHIRP enforces that GMRS
> channels follow the FRS channel number and frequency pairings, e.g. Channel
> 1 is 462.5625, Channel 18 is 462.625, etc. I've been trying to find in the
> FCC regs if this mapping is a requirement of GMRS operation. The only place
> I've found the channels spelled out is on 47 CFR Part 95B ?95.563 "FRS
> Channels" (link), but GMRS seems only to specify the frequencies and
> bandwidth which may be used via Part 95E ?95.1763 "GMRS Channels" (link).
> It's entirely possible that I've missed the clause requiring this mapping,
> and I am not a lawyer, so apologies if I've overlooked it.
> > > >  > > >
> > > >  > > > When I am programming a GMRS radio, I don't always want what
> my family refers to as our "channel 1" to be 462.5625. Likewise I may want
> to set up different repeaters that may use the same frequencies, but
> different tones (especially on radios where I cannot edit the tone from the
> radio itself) I am able to program the RB26 to accept an alternate
> GMRS-legal frequency with a little trickery, so there does not seem to be a
> firmware restriction enforcing this and it hasn't bricked my radio (yet).
> > > >  > > >
> > > >  > > > Would it be possible for CHIRP to accept GMRS-legal
> frequencies in any channel slot, and not require the FRS channel-frequency
> mapping?
> > > >  > > >
> > > >  > > > Thank you,
> > > >  > > > Chris Romp
> > > >  > >
> > > >  > > The BTECH GMRS-V1 channel assignments are in firmware. Even if
> CHIRP
> > > >  > > would let you put in different frequencies, it wouldn't make any
> > > >  > > difference. Channel 1 will always be 465.5625 MHz.
> > > >  > >
> > > >  > > The Retevis models are programmed to match how the OEM software
> > > >  > > behaves. Some of the newer Retevis models let you program the
> GMRS
> > > >  > > frequencies in the radio however you please.
> > > >  > >
> > > >  > > Jim KC9HI
> > > >  > _______________________________________________
> > > >  > chirp_users mailing list
> > > >  > chirp_users at intrepid.danplanet.com
> > > >  > http://intrepid.danplanet.com/mailman/listinfo/chirp_users
> > > >  > This message was sent to Nigel Gunn, W8IFF at nigel at ngunn.net
> > > >  > To unsubscribe, send an email to
> chirp_users-unsubscribe at intrepid.danplanet.com
> > > >  > To report this email as off-topic, please email
> chirp_users-owner at intrepid.danplanet.com
> > > >
> > > >  Nigel A. Gunn, ///shoulders.outwards.resolutions tel +1-937-971-0366
> > > >  Amateur Radio G8IFF W8IFF and GMRS WRBV701, e-mail nigel at ngunn.net
> www http://www.ngunn.net
> > > >
> >
> > Nigel A. Gunn, ///shoulders.outwards.resolutions tel +1-937-971-0366
> > Amateur Radio G8IFF W8IFF and GMRS WRBV701, e-mail nigel at ngunn.net www
> http://www.ngunn.net
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