Guy, I plugged this KPA into the same socket as my current KPA is operating from, so the 120v power source is not the problem. I also swapped power cords with one that was working.
Thanks, Mike AD5A > On Feb 16, 2016, at 12:07 PM, Guy Olinger K2AV <k2av....@gmail.com> wrote: > > Hmm. One of the reasons people get a KPA500 is because they can't get 240 to > the shack and the KPA will run on 120V. That makes it non-idiotic to inquire > upon the 120V supply. > > I heard of a problem something like this, not a KPA500, that turned out to be > a defective wall outlet. I would imagine that the KPA500 is unforgiving of a > precipitous drop in AC voltage. In the case I cite, all kinds of wierdness in > the shack went away when the wall outlet was replaced. The defective wall > outlet had internal blades that were badly pitted. It was also very old by > any means of estimate. > > I also heard of a power cord that was not crimped correctly inside the molded > plug, discovered upon dissection style autopsy afterwards. > > Other issues would be aluminum wiring that had not been tightened up, a > single bad socket in a power strip, etc. Also have heard of a wall socket > connection where one of the screws on the outlet had never been tightened. > > A KPA500 is a hard pull on a 120V socket. It would not matter to the AC power > that you were just hitting 10 watts, because you turn on the idling current > as soon as any RF is sensed. > > Do not assume that the 120V supply is A-OK. Verify everything on that 120V > circuit, up to and including the breaker in the breaker box. Breakers go bad > too. > > In any event the very best of luck chasing this aggravating problem. Please > let us all know what finally turns out to be the actual problem and what you > did to fix it. > > 73, Guy K2AV > >> On Tue, Feb 16, 2016 at 11:48 AM, Cliff Frescura <c...@cfcorp.com> wrote: >> Can you measure the 110V line voltage on key down? Is it stiff enough? >> >> 73, >> >> Cliff K3LL/6 >> >> -----Original Message----- >> From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mike >> Crownover >> Sent: Tuesday, February 16, 2016 8:22 AM >> To: 'Nr4c' >> Cc: elecraft@mailman.qth.net >> Subject: Re: [Elecraft] KPA500 problem >> >> Bill, >> >> Did that, it's set for 110v. I used the yellow tap, which gives me 75 v, >> right in the middle of the spec. I did try the other two, but same behavior. >> >> Thnaks, >> >> Mike AD5A >> >> -----Original Message----- >> From: Nr4c [mailto:n...@widomaker.com] >> Sent: Tuesday, February 16, 2016 10:19 AM >> To: Mike Crownover <a...@gvtc.com> >> Subject: Re: [Elecraft] KPA500 problem >> >> What input voltage is it configured for? >> >> Check manual for voltage tap info. >> >> Sent from my iPhone >> ...nr4c. bill >> >> >> > On Feb 15, 2016, at 11:11 PM, Mike Crownover <a...@gvtc.com> wrote: >> > >> > I just bought a lightly used KPA500. It arrived from the seller, well >> > packed and complete with cables, manuals, etc. I turned the amp on, >> > interfaced it with my K3, keyed the radio and the KPA500 immediately >> > shut-off. No fault light or error code, nothing. It shuts down just as >> > if I had pressed the power button, the fan runs, etc... The antenna is >> > resonant 1:1, I've lowered input power to 10 watts, swapped coax, >> > hooked it up to another K3, used RCA to RCA cable, the Elecraft cable, >> > etc.. When down to 10 watts input, I can tap the paddle like a >> > straight key lightly and the amp works, but put two dits together and >> > it >> shuts down. >> > >> > >> > >> > Has anyone had an experienced anything like this. I keep thinking this >> > has to be something simple. >> > >> > >> > >> > Mike AD5A >> > >> > ______________________________________________________________ >> > 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 Message delivered to >> > n...@widomaker.com >> >> ______________________________________________________________ >> 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 Message >> delivered to c...@cfcorp.com >> >> >> >> ______________________________________________________________ >> 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 >> Message delivered to k2av....@gmail.com > ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
