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Cut repeater antenna to TX or RX Frequency?

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johndjmix

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Jun 16, 2014
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Probably a bit of a silly question for more seasoned people on here. Im using a TRAM antenna for a repeater - and have the cut chart in front of me. Do I cut the antenna for the transmit frequency or the receive frequency?

I would think transmit?

--John
 

johndjmix

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Jun 16, 2014
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Thanks ko6jw, im thinking of picking up a MFJ-259C. Sounds like a good unit from what ive read.

--John
KD2GSU
 

prcguy

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Jun 30, 2006
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So Cal - Richardson, TX - Tewksbury, MA
+1 on tuning for the TX frequency. Usually an antenna you would use on a repeater should have adequate BW to cover both TX and RX frequencies, but hopefully it will not be so narrow band to notice any degradation on RX.

I've had a couple of MFJ antenna analyzers and they all broke, they are basically toys. In fact, everything I ever had from MFJ broke. I bought a Comet CAA-500 antenna analyzer and am very happy with it.
prcguy

Thanks ko6jw, im thinking of picking up a MFJ-259C. Sounds like a good unit from what ive read.

--John
KD2GSU
 

ko6jw_2

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Santa Ynez, CA
Comet CAA-500 is an excellent tool. Does not analyze complex impedance, but that's not necessary most of the time. Recently found it to be confused by other nearby transmitters. I was using it to tune a unicom antenna at our local airport and it was zapped by the AWOS transmitter located nearby. Not for use in strong RF fields.
 

Voyager

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Nov 12, 2002
Messages
12,060
Yep. ALWAYS TX. The SWR is much more critical there than on the RX frequency.
 
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