Hi Ed I recall having had a similar experience with my K3 some years ago, although it wasn't on 40m. I think it was either 10 or 12m and related to an antenna connected to the ANT 1 socket.
Eventually I tracked it down to having previously had an antenna connected to the ANT 2 socket and having used the ATU in the K3 to tune it at that time although I think that there was no antenna on ANT 2 when the problem cropped up. I believe that the feed through between ANT 1 and 2 sockets was sufficient to give a false SWR reading on the K3. It might be worth investigating this and possibly swapping over your antenna/dummy load to the ANT 2 socket to see what happens. I think I eventually just retuned the ATU on ANT 2 with a dummy load in place and the problem went away. Good luck. Barry VK2BJ On Mon, 21 Jan 2019 at 04:17, Ed G <[email protected]> wrote: > Hello, > My K3 is exhibiting some SWR meter behavior I don’t quite understand. > To eliminate any possible effects of antennas or cabling, I hooked a > Palstar DL2K dummy load directly to the K3 antenna connector. All bands > except 40 meters seem fine, with SWR reading as you would expect with a > dummy load. The anomaly I am seeing is that SWR as shown on the K3 meter > looks fine at 7.01 MHz (approx. 1.2:1), but as I go up in frequency, the > SWR as shown on the K3 meter rises. When I transmit into the dummy load on > 7.298 MHz, the K3 meter reads almost 3:1. I can switch in the K3 internal > tuner and bring the SWR down to 1:1. > I also tried an older Cantenna dummy load with the same puzzling > results. Any ideas as to what may be causing this 40 meter only problem? > I first noticed this problem during NAQP SSB when using my Steppir, which > of course retunes itself as I change frequency. When going from the low > part of the phone band to the high part on 40 meters, I noticed SWR > increasing on the K3 meter, even though it was not increasing and stayed at > 1.2:1 on my inline LP-100A. The K3 also started to fold back power. That > prompted me to do the further testing with the dummy load as I discussed > above. > --Ed— > > > Sent from Mail for Windows 10 > > > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
