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Comet GP-3 GMRS

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W3AWF

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Has anyone ever used a Comet GP-3 antenna for GMRS? I have googled it and can't seem to find anyone that has said anything about it. I'm trying to use that for my repeater and have to buy another antenna.


"Interoperability is not a luxury, it is a necessity!"
 

prcguy

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I don't have a GP3 but have measured GP6s and GP9s and they will not cover GMRS with a useable match. You would be trying to use the antenna a good 17MHz away from where its designed to work.

There is a commercial version of the GP9 that covers 460 to 470Mhz and I've used those on a few low power commercial repeaters.
prcguy
 

amphibian

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Feb 27, 2017
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Canton, Texas 75103
Has anyone ever used a Comet GP-3 antenna for GMRS? I have googled it and can't seem to find anyone that has said anything about it. I'm trying to use that for my repeater and have to buy another antenna.


"Interoperability is not a luxury, it is a necessity!"


The GP-3 is for the 440-446 frequecy range which is Amateur bands..... GMRS antennas need to designed for the 460-468 frequency range. Use of the GP-3 for a base or repeater antenna connected to your GMRS transmitter would eventually burn the finals out because of too much reflected power back to the transmitter.

You may want to check these antennas out. I have used similar in a pinch and for short distance coverage (15-20 miles) when mounted on short buildings or towers. Also have used them on Tall buildings where it was easy to get to the roof to replace the antenna when by Decibel antennas were delivered.

Tunable Adjustable Aluminum Base Antenna 400-500 MHz 5 dBd UHF Female SO239 1450 | eBay

You might check these out also.... I've had a few small minor issues with these but nothing that wasn't correctable....

Dual Band VHF UHF Base Antenna (Ham, Commercial, MURS, GMRS, FRS) DBJ-1 | eBay

Hope this helps....
 
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