I would think the KAT2 should be bypassed. The KX3 internal ATU is automatically bypassed, perhaps the KAT2 is not? (Don’t own a K2, but there should be no need for the internal tuner to be active).
Grant NQ5T K3 #2091 KX3 #8342 > On Aug 13, 2018, at 11:22 PM, Steve Witt <[email protected]> wrote: > > I have a K2, my first radio, that I've been operating for several > months now. Just purchased a KXPA-100 with the KXAT100 internal auto > tuner option, that I got working today, meaning that I got the keying > circuit prototyped and working so the radio would key the amp. It > seemed to work well and I was able to make a few contacts on FT8. My > K2 has the KAT2 antenna tuner build in. I do not understand how the > antenna tuner in the radio and the antenna tuner in the amp should > interact. At first I had the KXAT100 in the amp in auto mode and it > seemed to be tuning as I changed freqs. Then I tried the 'tune' button > on the radio (sort of to see what would happen) and the antenna tuners > in the radio and amp started tuning. My expectation was that the > KXAT100 would present a fairly stable 50 ohm impedance to the radio > and so the radio's tuner would not tune very much. I noticed that as I > changed bands though, that 'tuning' on the radio caused both antenna > tuners to change quite a lot (judging from the racket the relays in > both radio and amp made). By the way, my antenna is a 66 ft. Carolina > Windom 40m - 10m with about 150 ft of RG-213. Everything in the > antenna/feed system is just a few months old and the SWRs on the > K2/KAT2 have been 1.1 or 1.2. > > So I'm wondering what might be the proper way to control the two > antenna tuners in this setup as I change bands? > ______________________________________________________________ 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]
