[Elecraft] K4 observation

[Tom Doligalski]

Interesting, and possibly related (and I kind of forgot till I read Jim’s email). 

Noticed that when the antenna are disconnected, and the K4 turned off, I hear a local TV station in the headphones… Never happened on the K3.

Headphones connected to the rear panel jack.  

Gonna get out the ferrites…

Tom W4KX

Sent from my iPad 

> On Jun 18, 2021, at 2:07 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> 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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