Just a follow up to what Elecraft found on my new KPA500 that had spurs on RX, which I sent back to them since the replacement front panel did not fix the issue. Elecraft did indeed see the problem and said it was pretty bad. They replaced the filter cap in the +5V supply that went to the LPF, and added additional filter caps to the front panel. Any remaining spurs are now below spec.
I was at least happy Elecraft saw the issue, as I had several responses (direct) to my initial report on the reflector here that I did not know what I was talking about and what I described could not happen. 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: > >> On Mar 9, 2019, at 9:14 AM, Gary NC3Z <n...@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 >> >> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
