This is a bit more invasive, but a few earlier KPA100 modules had a problem with the interface connector to the main RF board that carriers the +13V to the KPA500 itself. The pin corroded and heated and, in a few cases, burned. I believe the current KPA500's have gold plated connectors. Of course, that removed all power from the 100 watt amp.
I'd remove the KPA500 module and inspect the connector. You can reach the screws from the top (careful - don't drop the screws or lock washers - they can be a chore to retrieve if you don't have a small magnet). Pull the module off and look closely at the multipin connector to see if there's any sign of overheating or discoloration. Ron AC7AC -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Robert Mccormack Sent: Saturday, December 10, 2011 4:07 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3/100 - High power problem Hi All, Many thanks - yes PA NOR was and remains enabled but 12 watts is still maximum power available. This K3/100 was delivering 100 watts before I commenced the CAL procedure - the only reason I took the top cover off was to find the FL1 offset, so nothing has been disturbed. I've run out of ideas.<G> 73, Ken ZL1AIH --- On Sun, 11/12/11, Ron D'Eau Claire <r...@cobi.biz> wrote: From: Ron D'Eau Claire <r...@cobi.biz> Subject: RE: [Elecraft] K3/100 - High power problem To: "'Robert Mccormack'" <zl1...@xtra.co.nz>, elecraft@mailman.qth.net Date: Sunday, 11, December, 2011, 11:44 AM Make sure the KPA100 option is installed and enabled. That sounds like it is not (the basic K3 has a 10 watt transmitter). Suggest you look in the Owner's manual and perform the procedures to enable and then test and calibrate the KPA100. Likely that will point to the problem. Good luck! Ron AC7AC -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Robert Mccormack Sent: Saturday, December 10, 2011 2:09 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3/100 - High power problem While checking a K3/100 #4114 on behalf of SK estate, I find that the power cannot be set higher than 12 watts. Operation was normal until I commenced a CAL procedure to correct a 2kHz difference between 'indicated' and transmitted frequency. Checked all the menu functions but can't find any reference to power limitation - searched the archives but no luck. Any help is appreciated. 73, Ken ZL1AIH. ______________________________________________________________ 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 ______________________________________________________________ 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
