Check for burn marks or carbon traces, both on the inside and outside, of the SO-239 connectors. These may look good with the antenna analyzer but fail under power.
I've also had PL-259's arc from center pin to shell on the inside. These required removal/ disassembly of the coax in order to actually find the fault. In all cases, once a flashover occurs, replacement of the connector is the only solution. Bob, K4TAX Sent from my iPhone > On Sep 27, 2019, at 6:00 AM, John Langdon <woyb10...@outlook.com> wrote: > > If it also happens with a dummy load, and the antenna analyzers shows the > same graph as before for R, X, then it is likely one of the connectors > between the KPA1500 output and the antenna. The one such problem I had was > old jumper I had put in to add an SWR bridge/monitor. It looked okay, and was > finger tight, but when I replaced it in an A/B test, the problem went away. > > The other time, the antenna had changed its impedance curve, but was still > 'okay' and the tuner was trying to retune for it. > > 73 John N5CQ > > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On > Behalf Of Jim Brown > Sent: Friday, September 27, 2019 4:19 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KPA-1500 failing on 160...AGAIN! > >> On 9/26/2019 10:26 PM, Peter Dougherty wrote: >> Any idea where to start looking here? > > And if it's a vertical, what about the radial system? > > 73, Jim K9YC > ______________________________________________________________ > 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 woyb10...@outlook.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 rmcg...@blomand.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
