GMRS - General Mobile Radio Service

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General Mobile Radio Service


GMRS has been around for many many years. Before about 1989, individuals and organizational entities could obtain licenses to operate this band. This changed around 1989 so that only individual people can obtain licenses. However, all previous licensees were grandfathered in. Thus, GMRS today contains elements of the old school, plus the new.

If you are reading this you probably do not care about the old school and are only interested in what GMRS has to offer for your basic communication needs. In support of this, we will only concern ourselves here with GMRS as you find it hanging on the wall of your local Home Depot or Wal-Mart.

For completeness references to previous GMRS jargon like Interstitial, Lower 550, Upper 600, etc. are included. However, you really only need to pay attention to the "Well Known Channel" the radio manufacturers like Cobra, Uniden, Midland, etc. seem to have agreed on. Namely, FRS only radios have channels 1-14 (and have their channels clearly defined by the FCC regulation 95.627) and GMRS/FRS hybrids have 1-22.

Look at this chart to see what I mean:

Well
Known
Channel
Name
GMRS Jargon
Channel
Name
Frequency Notes Max
Power
1 Interstitial 5625 462.5625 MHz Also FRS Channel 1 5.0 Watts
2 Interstitial 5875 462.5875 MHz Also FRS Channel 2 5.0 Watts
3 Interstitial 6125 462.6125 MHz Also FRS Channel 3 5.0 Watts
4 Interstitial 6375 462.6375 MHz Also FRS Channel 4 5.0 Watts
5 Interstitial 6625 462.6625 MHz Also FRS Channel 5 5.0 Watts
6 Interstitial 6875 462.6875 MHz Also FRS Channel 6 5.0 Watts
7 Interstitial 7125 462.7125 MHz Also FRS Channel 7 5.0 Watts
15 Lower 550 462.5500 MHz GMRS Only 50.0 Watts
16 Lower 575 462.5750 MHz GMRS Only 50.0 Watts
17 Lower 600 462.6000 MHz GMRS Only 50.0 Watts
18 Lower 625 462.6250 MHz GMRS Only 50.0 Watts
19 Lower 650 462.6500 MHz GMRS Only 50.0 Watts
20 Lower 675 462.6750 MHz GMRS Only 50.0 Watts
21 Lower 700 462.7000 MHz GMRS Only 50.0 Watts
22 Lower 725 462.7250 MHz GMRS Only 50.0 Watts
550 Upper 550 467.5500 MHz Typically GMRS Repeater Input 50.0 Watts
575 Upper 575 467.5750 MHz Typically GMRS Repeater Input 50.0 Watts
600 Upper 600 467.6000 MHz Typically GMRS Repeater Input 50.0 Watts
625 Upper 625 467.6250 MHz Typically GMRS Repeater Input 50.0 Watts
650 Upper 650 467.6500 MHz Typically GMRS Repeater Input 50.0 Watts
675 Upper 675 467.6750 MHz Typically GMRS Repeater Input 50.0 Watts
700 Upper 700 467.7000 MHz Typically GMRS Repeater Input 50.0 Watts
725 Upper 725 467.7250 MHz Typically GMRS Repeater Input 50.0 Watts

It all boils down to simply this. If you do not want to pay $80 to the FCC for a GMRS license, either get a FRS radio and use any channel you like or get a GMRS/FRS radio combo hybrid and only use channels 8-14.

If your people can't follow this rule, then don't get them GMRS radios or have them all get their own GMRS license.

Reprinted with permission from Astronomy Net


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