ThanksĀ I will look at the slides. Please note there is NO sound from the K3 as 
the S meter jumps around. The hum you hear is the fan on an Ethernet switch 
under my desk, it sounds much louder than it really is.
Rich


Sent from Yahoo Mail for iPhone


On Sunday, April 10, 2022, 3:33 PM, Jim Brown <[email protected]> 
wrote:

On 4/10/2022 1:21 PM, Rich Lim via Elecraft wrote:
> The S meter jumps all over th place even without an antenna attached.
> K3 and FTDX10 simultaneous

Sounds like you have a serious grounding and bonding problem.

Study N0AX's ARRL Book on the topic, to which I contributed, and/or 
these tutorial slides.

http://k9yc.com/GroundingAndAudio.pdf

73, Jim K9YC
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