For years I used a Radiosport headset with my K3. Worked like a champ. Since I 
received my K4 I noticed annoying RFI-induced feedback on the Radiosport when 
operating SSB on the K4. Monitor is set to 0. No trouble on the internal 
speaker. 

I’m gonna try ferrites next. 

Surprised to see this on the K4 and not on the K3!

Tom W4KX

Sent from my iPad 
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