There is a ground loop somewhere.  You need an isolation transformer in the audio line. You can try a passive device like this, or get an active device which costs a bit more https://www.amazon.com/dp/B08G9J74VX Cable Matters Ground Loop Isolator 3.5mm Noise Isolator Hum Eliminator for Car Audio and More

On 2/17/2026 4:44 AM, Suggs, Marvin (KTRK-TV) via BVARC wrote:
I have a Uniden Home Patrol scanner that I stream the audio from and it’s 
worked great for years. Recently the IT department replaced the computer and 
now I get a 60 cycle hum in the audio. I have a stereo cable going from the 
audio out on the Home Patrol to the headphone jack on the computer. Any idea on 
how to solve this problem could earn you a free cheeseburger 🍔.
Thanks
Marvin
N5RKW
Sent from my iPhone
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