Is there any chance RF is getting in to the KPA1500 via an alternative route, like one of your HF antennas, a faulty switch, loose bonding/ground, or even a change in house wiring or wifi router, antenna rotator cable, picking up the RF and radiating/routing it to the KPA1500 from the antenna? It's a shot in the dark, I know, but cut out everything but the direct signal path originating from the K3, pull all the house breakers not used, turn off everything--make only the 6m path active and see what happens if this makes sense to you.
I feel your frustration--the same thing in reverse took out my 2m EME station. I replaced every single thing, sent the K3 to Elecraft, the XV144 to Don...GUD LUCK OM! VY 73 Eric WD6DBM On Sun, May 31, 2020, 9:07 PM Peter Dougherty <li...@w2irt.net> wrote: > New coax and old coax behaved identically. HOWEVER, running into about 80 > feet of old RG-213 and into the Cantenna dummy load and it doesn't fault. > This is the only condition on 6m where there is no fault. Brand new coax, > old coax, brand new antenna, old antenna, with balun, without balun. Always > faults except when feeding the pure resistive dummy load. If there's any > reactance it trips or gives false SWR info. > > I would also add, why would a 2:1 SWR trip out the amp at 25 or 30 Watts > of drive? On the regular HF bands I can use the internal tuner to take out > a 2.5 or 3:1 SWR and it still sends 1400-1450 Watts up the pipe.. > > - pjd > > -----Original Message----- > From: Adrian <vk4...@gmail.com> > Sent: Sunday, May 31, 2020 11:05 PM > To: Peter Dougherty <li...@w2irt.net>; 'Paul Baldock' < > p...@paulbaldock.com>; elecraft@mailman.qth.net > Subject: Re: [Elecraft] NOT the feedline (was KPA-1500 faulting on 6m; SWR > issues) > > To remove any doubt, a 1.5kw or close dummy load at the end of the coax to > replace antenna, would confirm the amp issue. > > On 1/6/20 12:27 pm, Peter Dougherty wrote: > > Paul, please re-read what I wrote. The 90W figure is with the amp IN > > STANDBY! I wouldn't dream of putting more than about 35W into the > KPA-1500. > > I generally like to run about 1200W on 6m, but even if I turn my K3s > > drive down to 20 Watts, it will STILL hard-fault regularly. NO AMOUNT > > OF DRIVE from the K3s will stop these problems. If the amp is set to > > deliver power it's going to fault on 6m, regardless of what the ATU is > > set for (bypass or inline), and the KPA will miss-read the SWR of the > antenna system. > > > > The resistance figure is 50.8 Ohms, and the reactance is -11 according > > to the AA-230. The only difference between "works reliably" and > > "faults out all the time" is one is a resistive-only load, the other > > has a reactive component. > > > > - pjd > > > > - > > > > ______________________________________________________________ > 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 norrislawfi...@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
