Bug #5753

Update FRS and GMRS frequencies in stock config

Added by A J almost 3 years ago. Updated about 1 year ago.

Status:Closed Start date:04/25/2018
Priority:Normal Due date:
Assignee:- % Done:


Target version:-
Chirp Version:0.4.0 Platform:Windows
Model affected:(All models)


Since new rules in 2017 made changes to FRS and GMRS frequencies it would makes sense to split these now.

There are 22 FRS frequencies, all require narrow band and 12.5 KHz step from my understanding, see: https://www.fcc.gov/wireless/bureau-divisions/mobility-division/family-radio-service-frs

There are 30 GMRS frequencies, 22 of which the frequency share is shared with FRS but many of the GMRS are allowed on (wide) FM with 20 KHz step, see: https://www.fcc.gov/general-mobile-radio-service-gmrs#block-menu-block-4

For example 462.550 mhz is NFM in FRS but FM in GMRS.

Since receiving NFM when configured for FM causes low volume issues or vice-versa seems it would be best to have two separate sets of these frequencies, if there is a truly cross-compatible set of frequencies here perhaps a 3 third merged list would be appropriate to allow users to easily select which they would prefer.

I have some programing experience and/or I provide FRS and GMRS standalone file if that helps.


Baofeng_BF-F8HP_20180706_FRS-GMRS-MURS-WX.img - For reference and feedback, my base configuration (6.3 kB) A J, 07/06/2018 08:29 am

Baofeng_BF-F8HP_20180706_FRS.img - Purposed FRS configuration for feedback (6.3 kB) A J, 07/06/2018 08:29 am

Baofeng_BF-F8HP_20180706_GMRS.img - Purposed GMRS configuration for feedback (6.3 kB) A J, 07/06/2018 08:29 am

Associated revisions

Revision 3276:dd3f5ade0881
Added by Andrew Jorgensen about 1 year ago

[frs/gmrs] 2017 rule changes Fixes #5753

This adds the additional FRS channels (15-22) and expands GMRS channels include
all frequencies add in the 2017 rule changes.

It also adds the GMRS repeater channels with the prescribed +5.0MHz offset
(though you'll have to find the correct tones for your local GMRS repeaters).

After some feedback on the mailing list, I've chosen to number the channels
according to the FRS numbering, rather than try to preserve the obsolete
numbering, and I've chosen to name the GMRS repeater channels with both the
"550" style numbering that's common in repeater naming and the "15R" name that
makes it clear that it's receiving on channel 15.


Updated by Tom Hayward almost 3 years ago

You can find information about submitting a patch here: DevelopersProcess

Updated by A J over 2 years ago

Here are some configures I would appreciated feedback on my interoperation of the FCC rules as I am relatively new to interpreting them. I had to get creative in the GMRS channel naming as it appears there are two different number schemes for the frequencies, open to ideas or recommendations on this.

I am also adding a base configuration I use, other may enjoy and/or have feedback on this, it covers FRS, GMRS, MURS, and Weather, I typically remove the duplicate GMRS/FRS interstellar frequencies in the 467 MHz range as there is no difference in these between GMRS and FRS both are NFM and low power.

Updated by Jim Unroe over 2 years ago

  • Status changed from New to Feedback

CHIRP Radio Images (.img) file are specific to a particular Vendor/Model of radio. Stock Config files on the other hand are Comma Separated Value (.csv) files and are not specific to any particular radio Vendor/Model.


Updated by Andrew Jorgensen about 1 year ago

  • Status changed from Feedback to Closed
  • % Done changed from 0 to 100

Applied in changeset dd3f5ade0881.

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