[Elecraft] Nasty spurs on RX with new KPA500

[Gary NC3Z]

Yes all are checked. Today I undid the front panel and as I move it away 
from the rest of the KPA500 the spurs drop, so it is coming from the 
front panel. The spurs also change pattern when I set the different 
levels of brightness.

But more interesting, when I searched the archives using "birdies" I 
found a few reports of exactly the same issue I am having here, almost 
verbatim. Some SN are 4xx while other were 2xxx and 3xxx. But 
unfortunately no followup in the archive.

So will have to wait for Elecraft to respond to my submitted report. But 
at least I have not been alone in this issue and it goes back a good ways.

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

On 3/9/2019 13:44, Jack Brindle wrote:
> Gary;
>
> By now I am sure you have checked all the ribbon cable connections and are sure they are plugged in properly.
> This sounds like a problem that needs to be addressed by the tech support guys. Be sure to give them a call on Monday.
>
> 73!
> Jack, W6FB
>
>> On Mar 9, 2019, at 9:14 AM, Gary NC3Z <nc3z at outlook.com> wrote:
>>
>> Connecting the RX directly to the antenna and the spurs are not there,
>> the spurs are coming from the KPA500, and only when the KPA500 is
>> connected to a radio (happens on all my radios connected to the KPA).
>> Have tried the amp on 220 and 120, same issue. The KPA500 can be
>> connected to a dummy load at the RF Out, and RF In to the RX and the
>> spurs are there. With out a doubt they are being generated in the KPA500
>> when the LCD backlight is on, and these are healthy spurs.
>>
>> I have spent hours taking the thing apart and putting back with the same
>> results. Tripled checked all assembly with no luck. But I am 100%
>> positive it is directly related to the LCD backlighting. This is a very
>> weird issue!
>>
>> Gary Mitchelson
>> NC3Z/4 Pamlico County, NC FM15
>> NC AHIMT COML
>> SHARES NCS997
>> NC Deputy Auxcomm Coordinator - Statewide
>> www.mitchelson.org
>>
>> On 3/9/2019 09:45, Andy Durbin wrote:
>>> Nothing heard or seen on 10 m with my kit built KPA500.
>>>
>>> I'd suggest disconnecting the RX from the KPA500 and connecting it directly to the antenna.   Does the problem go away?
>>> If not, connect the RX directly to the dummy load.  Does the problem go away?
>>> If not,  disconnect everything else from the KPA500 except the power cord.  Does the problem go away?
>>> If not, connect the KPA500 to an outlet on a different circuit.  Does the problem go away?
>>>
>>> Hopefully, one of these steps will give some information on the source of the problem.
>>>
>>> 73,
>>> Andy, k3wyc
>>>
>>>
>>>
>>>
>>>
>>>
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