Try a “slightly different tap position” and see what happens. Your words, not mine.
…bill nr4c > On Jul 22, 2016, at 12:19 PM, brian <[email protected]> wrote: > > Guys, > > I've run into something on 80M trying to use the internal antenna tuner. > It fails to tune to a low SWR. > > My recollection is that the tuner worked fine on the same antenna before. > "Worked before" may have been with a slightly different tap position. > > Antenna is an MFJ 1/8 Wave vertical with loading coil and 4:1 "Guanella" > balun at the antenna base. > > With the current coil tap an RF analyst antenna analyzer shows the following: > > 3.55 MHz SWR=2.0 Z=35 ohms > 3.6 SWR=2.7 Z=36 ohms > > The K3 in the tune position (tuner out) shows SWR's of 1.7 and 2.4 > respectively. > > The antenna tuner finds a match for a 50 ohm dummy load OK. Using those > settings as a starting point, we attempted to match the antenna. > > The best it can do is bring the 1.7 SWR down to 1.4. The 2.0 SWR can brought > down to 1.7 at best. > > Other bands work OK. > > Any thoughts? > > 73 de Brian/K3KO > ______________________________________________________________ > 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]
