[Elecraft] Nasty spurs on RX with new KPA500

[Gary NC3Z]

SN 3759 just received 2 days ago (kit form) and put in operational the 
station. TX is fine, issue is on RX. It puts out strong spurs on 20-6M 
with 10M being the worst. Tested on live antennas and dummy loads, 
grounds on and off, all ancillary connectors removed, etc. So far this 
is making the use of the upper bands very difficult. Now I know the 
KPA500 has been around for a good amount of time so it cant be a design 
issue.

I have a message into Elecraft but it's the weekend and wanted to just 
run I by the groups to see if there are any ideas, as I mentioned it was 
a kit, so I may have messed something up? But one big of diagnosis was I 
turned off the backlight display and it reduced the spurs tremendously.

Hopefully this is a one off issue and it can be resolved.

Here is a video of what I am seeing: https://youtu.be/63fEFb3qIqM

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Gary Mitchelson
NC3Z/4 Pamlico County, NC FM15
NC AHIMT COML
SHARES NCS997
NC Deputy Auxcomm Coordinator - Statewide
www.mitchelson.org