Communications For Your Astronomy Event - an Astronomy Net Article

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Communications For Your Astronomy Event
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Communications for your Astronomy Event
"General Mobile Radio Service"

by
John Huggins

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.

[Beginning] - [Next Page - Hybrid Radios]

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Communications for your Astronomy Event"General Mobile Radio Service"

Communications for your Astronomy Event
"General Mobile Radio Service"