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GMRS / FRS - Discussions related to GMRS (General Mobile Radio Service) and FRS (Family Radio Service) communications

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  #21 (permalink)  
Old 06-14-2017, 9:41 PM
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Originally Posted by radioman2001 View Post
Yea but you don't have to take a test


Don't have to take one for LMR either.


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If a repeater IDs and no one is on frequency to hear it, does it even make a sound? Yes, because KC5MVZ is monitoring you
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Old 06-15-2017, 11:26 AM
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The first thing I would do:

Who owns the land? I wouldn't advise just throwing up some random box up in a tree with an antenna, at least not in this day and age. It will sure raise some concern if located as it would be something out of the ordinary.

Is the land privatly owned? I would contact the land owner for permission, as that would be the only right thing to do.
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Old 06-17-2017, 9:38 PM
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Originally Posted by prcguy View Post
There may be other specifics buried in Part 95 rules, but here is one that pertains to GMRS repeaters and certain base stations. The way I understand it is the transmitter used in a GMRS repeater must be FCC type accepted as a Part 95 repeater and here is one specification called out for GMRS repeaters that is different than mobiles or hand helds:

(b) Each GMRS transmitter for mobile station, small base station and control
station operation must be maintained within a frequency tolerance of 0.0005%.
Each GMRS transmitter for base station (except small base), mobile relay
station or fixed station operation must be maintained within a frequency
tolerance of 0.00025%.

That would mean part of the FCC type acceptance for a GMRS repeater transmitter would include meeting 0.00025% frequency tolerance. That usually requires a high end TCXO or ovenized oslillator, something that most mobiles and hand helds usually do not have.
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The rules don't say more than "must be maintained within a frequency
tolerance of 0.00025%.". This can be intepreted to mean that a station could be periodically readjusted to maintain that required tolerance. In fact many TCXO'S can age out of that tolerance in 18 months or so, and require periodic maintenance.

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Old 06-17-2017, 9:39 PM
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So any narrow-band radio will do. GMRS was exempt from narrow banding except for tolerance?
A narrow band compliant radio will have that performance but does not need to be operated in narrow band mode.

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