[Elecraft] K3+KPA500+KAT500 RFI Revisited

[Jim Brown]

On 1/12/2024 12:18 PM, Jeff Wandling wrote:
> Seems like a while ago I was troubleshooting the RFI problem between the equipment.

Is everything in your home and your station properly bonded and grounded?
Is every chassis on your operating desk bonded together?
Is the operating desk common point bonded to all the grounds in your home?
http://k9yc.com/GroundingAndAudio.pdf
Are there arrestors on all of your antennas, and are they bonded to the 
other grounds?
Are there serious ferrite chokes at the feedpoint of every antenna? A 
serious ferrite choke is one of these.
http://k9yc.com/2018Cookbook.pdf
If you're using any form of end-fed antenna, including a vertical, does 
it have radials or a counterpoise?

There's one other mechanism that I'm aware of, having been a beta tester 
for KA500 years ago. When running two radios with amps and tuners, their 
frequency-detecting circuitry for station #1 while in receive can get 
enough RF from station #2 transmitting to switch to station #2's band. 
This depends primarily on how close the antennas for the two stations 
are to each other and how much power we're running. This is very old 
info, from the early days of KAT500, and may have been minimized by 
later versions of firmware.

73, Jim K9YC