Does anyone know if there is a serial number cutoff where this mod is in place? I am assuming the LPF board wil be marked to tell which rev lewvel it is? Tnx N2TK, Tony
-----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Arie Kleingeld PA3A Sent: Friday, November 06, 2015 2:38 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 no power out Frank, This looks like the problem I had with my KPA500 that turned out to be a fault in the T/R switch. My troubles also started on 7MHz. There's a modkit for that: E850607. I installed it myself. This has been in the reflector before. Look e.g. for the thread on KPA500 troubles of last October. 73 Arie Op 5-11-2015 om 22:48 schreef n...@comcast.net: > Can someone advise me on the following? > > My KPA500 (S/N 2663) Amplifier stopped working in the middle of a CW > QSO on 7MHz. > It has been working flawlessly for the past two months (since new). > > At the time: > Driver is a K3 running 20w and KPA500 running 400 watts. > Antenna tuner is a KAT500. > Antenna is a GAP Challenger. > Frequency was 7.07 MHz. > While transmitting, the SWR on the KPA500 went high and a Fault flashed. > The KPA500 seemed to reset its self and I continued sending. > The sequence repeated a few seconds later except that the KPA500 had > no output power. > Further testing resulted in the following findings: > > Reloaded the firmware. > > K3, KPA500 and KAT500 was connected in accordance with Figure 1, Page > 5, of the Owners manual. > For the following tests, the output of the KPA500 was connected > directly to the SWR meter and the SWR meter was connected directly to > the dummy load eliminating the KAT500. > > Frequency: 3.57 MHz, All works well. > > Frequency: 7.07MHz, K3: (ON) 100w, KPA500: (Standby), SWR on KPA500: > 1, SWR on SWR meter between KAT500 and dummy load: 1.1:1 > K3 power reduced to 10w, Switch the KPA500 to Operate, KPA500 no > lights indicating SWR or Power. K3: SWR and RF indicators jumping up > and down. Raspy tone heard in station monitor (TS-850). The LCD > shows: "7.0 MHZ" no matter which switch around the display I push or > how many times I push them or how long I hold the switch. > > Frequency 14.07 MHz, All works well. > > The KPA500 (kit) is under warranty, anyone know what s going on here? > Did I do something wrong? Is it time to send it back to Elecraft? > > Frank > N7FN > > > > > > ______________________________________________________________ > 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 > p...@xs4all.nl > ______________________________________________________________ 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 tony....@verizon.net ______________________________________________________________ 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
