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+ch...@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 <ni...@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+ch...@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+ch...@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@intrepid.danplanet.com > > > http://intrepid.danplanet.com/mailman/listinfo/chirp_users > > > This message was sent to Nigel Gunn, W8IFF at ni...@ngunn.net > > > To unsubscribe, send an email to > > chirp_users-unsubscr...@intrepid.danplanet.com > > > To report this email as off-topic, please email > > chirp_users-ow...@intrepid.danplanet.com > > > > Nigel A. Gunn, ///shoulders.outwards.resolutions tel +1-937-971-0366 > > Amateur Radio G8IFF W8IFF and GMRS WRBV701, e-mail ni...@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 ni...@ngunn.net www http://www.ngunn.net _______________________________________________ chirp_users mailing list chirp_users@intrepid.danplanet.com http://intrepid.danplanet.com/mailman/listinfo/chirp_users This message was sent to arch...@mail-archive.com at arch...@mail-archive.com To unsubscribe, send an email to chirp_users-unsubscr...@intrepid.danplanet.com To report this email as off-topic, please email chirp_users-ow...@intrepid.danplanet.com
