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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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