As Chris wrote you can start by trying some chokes if your audio cables are not shielded well. But I'd first try to check power source. If you're using a loptop, try to check if you still have the AC hum when your computer is not plugged (running on batteries). If that solves the problem, check if your grounding is OK (clean and low resistance) and reaching to the AC adapter. If you're using a desktop, I'd still start checking if grounding is OK. However, it is very likely that your sound card is just not able to filter that AC hum and if that's the case you'd need to isolate it yourself. Amazon has products for that. Just search for ground loop isolator. You don't need an expensive one, a $20 one does as good a job as $100 one if you're just using it for HAM.
Hope this helps. Gokhan KORALTURK On Tue, Feb 17, 2026, 08:19 Chris Martin via BVARC <[email protected]> wrote: > Seems like you might be getting EMI from the computer or the display. Were > both changed? Were there any.other variables that might have changed. Get > some ferrite core suppressor rings and clip them on the display cable and > the power cable to the new computer. Those may aliviate the RFI. They wont > interfere with the computer or display. > > > Sent from Yahoo Mail for iPhone > <https://mail.onelink.me/107872968?pid=nativeplacement&c=Global_Acquisition_YMktg_315_Internal_EmailSignature&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000604&af_sub5=EmailSignature__Static_&af_ios_store_cpp=9d3a686e-218d-4849-8298-b480188dc8ac&af_android_url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.yahoo.mobile.client.android.mail%26listing%3Demail_signature> > > On Tuesday, February 17, 2026, 04:45, Suggs, Marvin (KTRK-TV) via BVARC < > [email protected]> wrote: > > I have a Uniden Home Patrol scanner that I stream the audio from and itโs > 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 ๐. > Thanks > Marvin > N5RKW > Sent from my iPhone > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Publicly available archives are available here: > https://www.mail-archive.com/[email protected]/ > > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Publicly available archives are available here: > https://www.mail-archive.com/[email protected]/ > >
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