We’re testing a fix. 

W

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elecraft.com

> On Jun 18, 2021, at 2:21 PM, Tom Doligalski via Elecraft 
> <elecraft@mailman.qth.net> wrote:
> 
> 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 <j...@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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