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I'm running Motorola CDM 1250 40 watts, with a ID- O- Matic IV , Motorola 400HMz to 500z duplexer and LMR 400 coax with Comet CA 712 EFC antenna. My TX side is clear as a bell but my Rx side is weak with white noise in the back ground. the duplexer is tuned to -93db, and everything was tune and programed by Motorola techs. 

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On 12/30/2022 at 9:26 PM, jonesm0 said:

Some years ago, we found LMR feed line could be "noisy" in the UHF spectrum, fought it over a year, replaced with Belden 9913 and problem poofed....

This is good for duplex? I am also looking for new feed line for my repeater. I have LMR 400 and also experiencing noise.

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