Jeff; Do I understand that for the first test you are driving the antenna through the KPA500 and KAT500 (with KAT500 in bypass)? If so, it makes a lot of sense that you will see different SWR. The KPA and KAT are providing a completely different load for the K3. The better test is to feed the antenna directly from the K3 without the KPA and KAT in-line. I would expect you to see a closer match at that point, although I doubt they will ever be identical due to the differences in the directional couplers in the K3 vs the KAT500 (and KPA500 for that matter).
Jack, W6FB > On Jun 2, 2018, at 8:48 AM, jeff griffin <k...@arrl.net> wrote: > > I recently brought my KPA/KAT500 north for the summer and hooked up to my > trapped multiband fan dipole that I use here in NJ. I leave my K3 here for > remote use and use the amp at my winter home in Florida to use with my Flex > 6500 with a Steppir Vertical antenna without the KAT500 tuner. When I got up > here I installed the KIO3B option. The install went well with no issues, all > looked good so I connected the K3, P3, KAT500, and KPA500 with the Elecraft > provided cable set like I do every year. > > The issue I'm having is an SWR difference between the KAT500 and the K3. For > example if I use the K3's internal tuner I can on a chosen frequency achieve > an SWR of 1/1. I the put the internal K3 tuner in bypass mode and take the > KAT500 out of bypass and set to auto. I then use the xmit button on the K3 to > create a tune signal to be sent to the KAT500. The K3 then shows a 1/1, the > KAT500 about the same but the KPA500 which is in STBY mode shows around 3/1. > What this causes to happen is the Amp will fault out if I try to use any > power output. If I check the antenna with a trusted SWR meter I see 1.3/1 at > the frequency of use. I upgraded the firmware in all the devices in use, I > also did a reset of the KAT's stored frequencies memory, and checked both the > amp and tuner with the utility programs. I'm going to call Elecraft on > Monday, anyone have any ideas in the meantime I can try? > > 73 Jeff kb2m > > ______________________________________________________________ > 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 jackbrin...@me.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
