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Electrical Noise, how to eliminate the hissing and humming

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M

matt.lehtinen

Commercial & CFII - ASEL, Owner PA18R-201 N533PU
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Greetings, I'm a proud owner of a PA28R-201, that just received an avionics upgrade with two GI-275's, a GTN 650 Txi, and a GFC500 A/P. I've always had some hissing in my intercom from the electrical system, but it has definitely gotten worse with the new equipment. What do you all recommend in terms of a specific part number [filter] and installation technique to correct this issue? Thank you.
Matt Lehtinen
N533PU
 

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