[Elecraft] Nasty spurs on RX with new KPA500

[Bob McGraw K4TAX]

Gary:

Nothing heard on my K3S that is being produced by my KPA500 {s/n 3519} 
on 10M and nothing seen on my P3.

I would go back through each step of the assembly process and make sure 
all is correct and all hardware is tight.     I do see spikes from other 
sources on 10M but these are in the order of -125 dBm. Nothing out of 
the KPA500 in Operate mode that I can see or hear.

73

Bob, K4TAX



On 3/9/2019 5:36 AM, Gary NC3Z wrote:
> 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
>