I was very surprised to see that AM and SSB voice modes were allowed on GMRS. I don't believe I have ever seen a GMRS radio capable of those modes though.In English (per ITU website):
A1D AM, single channel, data
F1D FM, single channel, data
G1D PM, single channel, data (same result as FM)
H1D SSB full carrier, single channel, data
J1D SSB suppressed carrier (SSSC), single channel, data
R1D SSB reduced carrier (SSRC), single channel, data
*** A3E AM, single analog channel, voice ***
F3E FM, single analog channel, voice
G3E PM, single analog channel, voice
H3E SSB full carrier, single analog channel, voice
*** J3E SSSC, single analog channel, voice ***
R3E SSRC, single analog channel, voice
F2D FM, single channel digital, data
G2D PM, single channel digital, data
I would imagine it would have more impact on FRS users since they are more than likley using 1-7 frs primary channels also FRS can transmit on the main channels but only using 12.5khz so i would imagine an AM signal would drown them out even more.I should think I'd annoy a lot of people were I to begin transmitting in USB on any GMRS frequency...
Except for Garmin's digital data I have never heard of anything but FM being used since the 1970s. Back when Class A and Class B CB (now GMRS) was first created there might have been some AM radios made. I don't know when the current rule containing the emission designators was written or what the original ones were.Has there ever been a Part 95 radio that transmits on any of those other emission types?
GMRS licensees can, and do, use NFM. (You can't exceed the authorized bandwidth, but you can most certainly go as narrow as analog FM will allow.) Using NFM can help alleviate interference on GMRS repeater input frequencies from adjacent channel FRS users. Three of the four GMRS repeaters owned by the local users group in the Phoenix, AZ metro area are NFM. Some may argue that coverage area is compromised by going NFM compared to FM, but at least one of those repeaters still covers hundreds of square miles of the metro area due to an advantageous mountaintop location.FRS is NFM
GMRS is ONLY FM Mode.
Technically speaking you are correct / However, I would think that getting a radio that could utilize these modes, tested and certified wouldn't be a big deal, if such devices even existed.As for the other modes, there are no Part 95 certified radios that can do AM or SSB, so, technically, you could not legally use those modes.
It will not automatically conform to the FRS rules.Can anyone confirm, with certainty, that Motorola does (or does not) detect & comply with TX limits automatically?
You would be correct. If you really want to stick to the FCC rules, even putting the GMRS primary channels as well as the interstitials would not be allowed. Like I mentioned able, the lack of Part 95 certification on that radio would preclude it from use on GMRS.When in doubt, I comply with my most restrictive understanding of FCC regs. At face value, I'm inclined to say "absolutely not" to putting FRS 8-14 on an HT1250.
Ideally someone holding a GMRS license should understand the FCC rules that apply to that license. Apparently he/she either doesn't understand the rules, or is choosing to ignore them.This time, however the requestor *should* know his stuff, he provided me with both his ham & GMRS license numbers, and they're legit. I don't want to say "no" if it's legal to put these on a 1-4W radio if this radio does comply. Thoughts?
Well, welcome, thanks for joining us.Also, just have to say, as a long-time "guest", I've found this forum invaluable for figuring-out what I need, so much so, I've had all my previous questions answered without needing to ask them. This is the first time I haven't found a definitive answer through my searches.