It's a puzzler. CW is fine. Even 100W key down CW is fine, which I don't normally run on 6M. Can't figure out why CW is OK, but FT8 "creates" high SWR. Problem did not exist before replacing the LPA and PA. __________ 73, Jim - N4ST
-----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Mike Fatchett W0MU Sent: Monday, June 13, 2022 15:02 To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3S - High SWR on 6 Meters What is the 6m antenna, how far away is it from the xmitter? Sounds like an issue with a balun or matching overheating with the stress of FT8? I would hook the K3 up directly to the 6m antenna or the dummy load. Something is certainly acting odd. W0MU On 6/13/2022 2:07 PM, N4ST wrote: > So, received a new KLPA3A & KPA3A from Elecraft in exchange for my old ones > plus $$. > Installed the new KLPA3A & KPA3A and passed LP and HP TX Calibration. > My 6M beam measures 1.06 SWR on analyzer. > CW Key down, 100W, I get 1.2 on external SWR meter and 1 bar on K3S SWR > meter. > With FT8 I'm OK for 1 or 2 transmits and then I get infinity on external SWR > meter and full scale on K3S SWR meter, but full power out. > If I switch to a dummy load, I get zero power out (fold back?) > If I operate FT8 at 8 watts with the beam, I get 1.2 on external SWR meter > and 1 bar on K3S SWR meter and 8 watts out. > Going back to CW full power seems to perform a reset. Everything still fine > in CW, but now FT8 is OK for 1 or 2 transmits and then high SWR returns. > > Any advice? > A spur/oscillation in the KPA3A? > A relay stuck/not switching? > > My TenTec Eagle is carrying the load for me during these 6M openings. > (46 states worked in last few weeks) > > > ___________ > 73, > Jim - N4ST > > > ______________________________________________________________ > 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 w...@w0mu.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 hamsh...@n4st.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
