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Duplexer tuning

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nyscan00

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Hi, I have a celwave duplexer that is currently tuned to 464.XXX mhz and am going to be using it with a repeater on gmrs 462.XXX

I know this should be tuned so the duplexer freq matches the repeater freq but if its not how much would performance be affected? Would there be a significant signal loss out of the machine if its off by a few mhz?
Thanks
 

kayn1n32008

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Hi, I have a celwave duplexer that is currently tuned to 464.XXX mhz and am going to be using it with a repeater on gmrs 462.XXX

I know this should be tuned so the duplexer freq matches the repeater freq but if its not how much would performance be affected? Would there be a significant signal loss out of the machine if its off by a few mhz?
Thanks
Get 'em tuned, you wont regret it.
 

10-10

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Duplexers need to be tuned exactly to the frequency you want to pass and notch. 2 Megs off is huge. Won't work very well at all.
 

nyscan00

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ok thats what I figured. Just didnt know if the 2mhz was a big difference.
thanks for the help
 
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Get a copy of the specific tuning instructions and follow them. If you don't have access to the proper equipment find someone that can do it for you. Mis-aligned duplexers can really cause you a big headache.
 

ElroyJetson

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I tune duplexers frequently. 25 KHz is a large frequency change to a duplexer. I've had some that could be tuned so tightly that it affects the audio passband performance in a 5 KHz wide channel.


Get it tuned by a professional who has the right equipment. It's definitely worth the cost to do it right,
because it's almost impossible to do it right without the proper equipment and skills.

Elroy
 
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