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Need help selecting frequencies for my new repeater.

WSAX300

Newbie
Joined
Feb 29, 2024
Messages
1
Location
Charlotte
I’m building a new GMRS repeater and would like to know what the process is to selecting the frequencies that it works on. Can anyone assist?
 

MTS2000des

5B2_BEE00 Czar
Joined
Jul 12, 2008
Messages
5,246
Location
Cobb County, GA Stadium Crime Zone
Just remember, there is no coordination and one must share, regardless of how many or few repeaters are in use in a given area. Furthermore, one may wish to use a different PL/DPL combination to minimize interaction. Always program subscribers for TX inhibit on busy to avoid interfering with other users.
 

RFI-EMI-GUY

Member
Joined
Dec 22, 2013
Messages
6,878
I’m building a new GMRS repeater and would like to know what the process is to selecting the frequencies that it works on. Can anyone assist?
Beg borrow or steal a scanner that logs the channel and CTCSS tones in use and set it to scan and see who is on the air and how busy the channel is . Pick a channel with little activity and use that and avoid duplicating the CTCSS tones. do so for a week or two.
 

cavmedic

Member
Premium Subscriber
Joined
Sep 2, 2012
Messages
655
Location
Pottstown Pa
Beg borrow or steal a scanner that logs the channel and CTCSS tones in use and set it to scan and see who is on the air and how busy the channel is . Pick a channel with little activity and use that and avoid duplicating the CTCSS tones. do so for a week or two.
Preferably at the site of your repeater and using the antenna your repeater is going to use as well.

That way you can better determine any co channel issues easier than at ground level.
 

RFI-EMI-GUY

Member
Joined
Dec 22, 2013
Messages
6,878
Preferably at the site of your repeater and using the antenna your repeater is going to use as well.

That way you can better determine any co channel issues easier than at ground level.
Depends on the terrain. If the test is done on top of a mountain, every channel will be pretty much in use. In which case logging should be performed on the 467 MHz input side and via a bandpass filter if the site is congested or the receiver has poor IMD specs.
 

cavmedic

Member
Premium Subscriber
Joined
Sep 2, 2012
Messages
655
Location
Pottstown Pa
Depends on the terrain. If the test is done on top of a mountain, every channel will be pretty much in use. In which case logging should be performed on the 467 MHz input side and via a bandpass filter if the site is congested or the receiver has poor IMD specs.
👍👍
 
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