http://elecraft.85.s1.nabble.com/KPA500-Peculiar-behavior-no-power-output-on-Operate-tp7564452p7564455.html
for a solution. I'm sure he will soon be in touch after you have
> Hi, this is IW0HQE, Alessandro, from Italy, a very happy owner of the superb
> K-line.
>
> I would like to report what I consider a minor issue/behavior of my KPA500
> power amplifier.
>
> The amplifier is working flawlessly, and I am definately very satisfied with
> it. Only a very peculiar event happened a couple of times during the last
> week : when I turned on the amplifier and put it on Oper mode, when I begun
> my transmission the PTT triggered correctly (the * symbol appeared as well
> in the leftmost part of the display) but there was no power output at all.
> This was solved by simpli turning the amp OFF and then back online. I will
> now describe the event with further details :
>
> 1) I have owned the amplifier since 18/09/2012 (one month) and the event
> happened only two times during the last week.
>
> 2) The first time the event happened was right after my last K3 and P3
> firmware upgrades. After upgrading both the devices, I then turned on the
> KPA500 to work a DX station and there was no power output; turning OFF and
> then back ON the amp solved it.
>
> 3) The second time the event happened was a couple of days later : I was
> listening to some DX stations and pileups for fun, then I needed the
> amplifier to make a few calls, I turned ON the rear panel switch, put the
> amp on OPER and then begun transmitting, but still no power output. Turning
> the amp OFF and then ON solved it.
>
> 4) Both times the event happened, the rear panel switch was turned ON from
> the OFF position.
>
> 5) Power drive 20 watts. CW mode.
>
> 6) Temperature reading at the moment of the event : 22-23 °C.
>
> 7) SWR of my antenna on the band (15 meters the first time and 10 meters the
> second time) 1,3:1 or better.
>
> 8) HV : 74,3
>
> 9) Both the events happened after installation of Firmware Revision 04.51
> and DSP 2.76.
>
> 10) I tried to turn off the amplifier after the second event without
> switching the real panel button in the OFF position, and the event never
> happened again. I cannot figure out if this is just a coincidence, but maybe
> it could be of some use to report it.
>
> I have seen this event, or some that have a strong resemblance have already
> been reported :
>
>
http://elecraft.365791.n2.nabble.com/KPA-500-no-RF-until-power-cycle-td7017734.html>
http://elecraft.365791.n2.nabble.com/KPA500-No-power-out-in-quot-OPER-quot-mode-td7472228.html>
> I have reported mine also, as suggested by W6FB, Jack Brindle, so that
> Elecraft could add this to the feedbacks already received, evaluate and (I
> hope) find out and solve this minor issue.
>
> Thank you for your attention. My very best regards.
>
> IW0HQE - Alessandro Merolli
>
>
>
> --
> View this message in context:
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