On 6/18/2021 3:58 AM, Tom Doligalski via Elecraft wrote:
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.
I would blame that on the radio. Elecraft has a long history of Pin One
Problems, which are a well known cause of RFI. I first alerted Wayne to
this at least 15 years ago. Elecraft is not unique in the regard -- the
last time I was at Dayton, several years ago, EVERY radio on display in
booths that I was able to look at had obvious Pin One Problems. The
following links were written nearly 20 years ago. Pro audio has mostly
cleaned up its act. Ham radio is still in the dark ages.
http://k9yc.com/Pin_1_Revisited.pdf
http://k9yc.com/Pin_1_Revisited_Part_2.pdf
73, Jim K9YC
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