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Icom 746 pro picking up noise when hooked to the computer

Moleculo

Moleculo

Ham Radio Nerd
Apr 14, 2002
9,350
2,063
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A while back I hooked up my PC sound card to the Icom 746 pro using the acc1 port. I installed 1:1 isolation transformers inline of both the TX and RX lines to eliminate a ground loop. I noticed today when keying on AM and monitoring myself that I was getting a lot of popping and interference in the radio. I turned off the computer and it went away. Then I disconnected the computer connecting cable and it went away. Any ideas on how to eliminate this problem?
 

ok, I figured it out. The master volume on the sound card was maxed out and it was causing feedback on the radio, even though I'm using line out. I turned down the master volume to an appropriate level and the mess went away. DOH!
 

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