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

[Jim's Desktop]

I have a few birdies on 6, but after reading your post Jim, I checked 
them out against the KPA500 and so far I can't find any that I can 
attribute to the amplifier.  I marked down all the ones I could hear 
with the amplifier on and the LCD as bright as it will go.  I then shut 
the amp off and just to be sure, I disconnected power from it 
completely.  All the birdies originally noted were still there and none 
changed when I turned the amp back on.

I'd check all the cabling connections internal and external to the amp 
and see if you don't have one that's not completely seated causing a 
"Pin-1" problem.

Jim - W0EB

------ Original Message ------
From: "Phil Wheeler" <w7ox at socal.rr.com>
To: elecraft at mailman.qth.net
Sent: 2/26/2015 2:33:13 PM
Subject: Re: [Elecraft] KPA500: birdies on 6m from LCD backlight

>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
>>
>
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