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
"Hybrid Radios"

by
John Huggins

Some manufacturers have received approval to market radios that are certified for use in both the Family Radio Service (FRS) and the General Mobile Radio Service (GMRS). Other manufacturers have received approval of their radios under the GMRS rules, but market them as FRS/GMRS radios on the basis that:

Some channels are authorized to both services, or
A user of the radio may communicate with stations in the other service.

Radios marketed as "FRS/GMRS" or "dual-service radios" are available from many manufacturers and many retail or discount stores. The manual that comes with the radio, or the label placed on it by the manufacturer, should indicate the service the unit is certified for. If you cannot determine what service the unit may be used in, contact the manufacturer.

If you operate a radio that has been approved exclusively under the rules that apply to FRS, you are not required to have a license. FRS radios have a maximum power of ½ watt (500 milliwatt) effective radiated power and integral (non-detachable) antennas. If you operate a radio under the rules that apply to GMRS, you must have a GMRS license. GMRS radios generally transmit at higher power levels (1 to 5 watts is typical) and may have detachable antenna.

The 22 Channel Plan as it appears to be

Well Known Channel Name	Channel Name Jargon	Frequency	Notes	Max Power
1	GMRS Interstitial 5625	462.5625 MHz	FRS and GMRS Channel 1	5 Watts
2	GMRS Interstitial 5825	462.5825 MHz	FRS and GMRS Channel 2	5 Watts
3	GMRS Interstitial 6125	462.6125 MHz	FRS and GMRS Channel 3	5 Watts
4	GMRS Interstitial 6375	462.6375 MHz	FRS and GMRS Channel 4	5 Watts
5	GMRS Interstitial 6625	462.6625 MHz	FRS and GMRS Channel 5	5 Watts
6	GMRS Interstitial 6875	462.6875 MHz	FRS and GMRS Channel 6	5 Watts
7	GMRS Interstitial 7125	462.7125 MHz	FRS and GMRS Channel 7	5 Watts
8		467.5625 MHz	FRS Only Channel 8	0.5 Watts
9		467.5875 MHz	FRS Only Channel 9	0.5 Watts
10		467.6125 MHz	FRS Only Channel 10	0.5 Watts
11		467.6375 MHz	FRS Only Channel 11	0.5 Watts
12		467.6625 MHz	FRS Only Channel 12	0.5 Watts
13		467.6875 MHz	FRS Only Channel 13	0.5 Watts
14		467.7125 MHz	FRS Only Channel 14	0.5 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

Most FRS/GMRS radios seem to have the same 22 channel frequency assignments noted above. If this is true of all the 22 channel radios, this will really help keep things straight when someone says "Go to channel 11."

You should take care to ensure you operate on channels 8-14 if you do not have a GMRS license. The FRS/GMRS radios I have transmit more than 1/2 watt when on channels 1-7 and 15-22. Only on 8-14 (the FRS only channels) do they reduce power to the 1/2 watt FRS limit.

If you find yourself the least bit confused by all this, either do not get the FRS/GMRS radios or pay the FCC the money to get the five year family license. Or you may also just purchase a FRS only radio which has all fourteen FRS channels within the legal power limit.

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Communications for your Astronomy Event"Hybrid Radios"

Communications for your Astronomy Event
"Hybrid Radios"