[Elecraft] KPA500: birdies on 6m from LCD backlight

[Phil Wheeler]

No such problem here, at all, Jim. I wonder if you 
have a cabling issue?

Phil W7OX

On 2/26/15 11:47 AM, Joe Hall wrote:
> Just got a KPA500 kit a couple of weeks ago (S/N 2380).  Upon installing it
> in my system I immediately noticed sharp spikes about every 9.5 kHz (only on
> 6m) in my panadapter.  These spikes are "audible" on my K3 and appear
> whenever the KPA500 is on, whether in standby or operate.  Nothing at all
> noted on any band other than 6m.
>
> A google search of the mailing list archives revealed a couple mentions of
> the KPA500's LCD backlight.  So, I went in and adjusted the LCD brightness.
> Dropping the brightness to "DAY" (which seems to turn the backlight totally
> off) completely clears up the spikes on 6m, any setting other than "DAY" and
> it's there - I can switch back and forth and watch the spikes appear and
> disappear.
>
> My email to elecraft support resulted in a response of "turn off the
> backlight."  With no backlight the KPA500 display is unreadable in my shack.
>
> This is a relatively minor issue for me given that I rarely operate on 6m,
> but I'm anal enough that I'd prefer to solve rather than accommodate the
> problem.
>
> Anyone else seen this and/or have any ideas about how to deal with it, other
> than turning off the backlight?
>
> Thanks,
> Joe / WB1M
>