The 16 feet of window line makes me wonder if you're not trying to do a half-size G5RV, but got the top dimensions wrong. It would be 51' (instead of 67 which is REALLY bad on 20 meters), or a little longer, say 54' if you wanted to load on 17m and 12m.
My K2/10 and the auto tuner will match most anything, but your lengths are not anything I would do on purpose for multiband : >) On Fri, Jan 15, 2010 at 7:49 PM, Don Wilhelm <[email protected]> wrote: > Dave, > > If you did not disconnect the KAT2, then please tell us the setup (all > the connections) when you have SWR readings below 1.5. > That may be capable of providing some sort of clue. > > 73, > Don W3FPR > > djmd wrote: >> >> And re: your follow up - all the testing was done with the KAT2. I have >> never disconnected it. >> >> >> >> >> >> Don Wilhelm-4 wrote: >> >>> Dave, >>> >>> Is that a 1:1 balun or a 4:1 balun. Usually a 1:1 works better, but >>> whichever balun you are using, try the other one and see what happens. >>> Do you have an antenna analyzer? or can you borrow one? If so, what is >>> the impedance at the end of the coax? Both the resistive and reactive >>> components please - just the SWR does not provide much information on >>> how to advise you to proceed. >>> >>> You may be better off eliminating the coax entirely and running the >>> window line all the way into the shack. >>> 73, >>> Don W3FPR >>> >>> djmd wrote: >>> >>>> Hello, >>>> >>>> I have been trying to troubleshoot my antenna system, and have been >>>> trying >>>> to avoid the dreaded "high swr" post, but I've run out of ideas, so I'm >>>> turning here. >>>> >>>> First let me explain my system. 67' dipole fed by 16' of window line. >>>> That's >>>> connected to an Elecraft balun. From the balun, there's a short piece of >>>> coax going to a barrel and into the basement (through a piece of cement >>>> backerboard. From inside the basement, there is another piece of coax, >>>> about >>>> 12', connected to the barrel, and going up into the bedroom directly to a >>>> K2 >>>> with an autotuner. >>>> >>>> Before the K2, I was using a Yaesu FT840 with an MFJ tuner. After >>>> tweaking >>>> the window line length and the actual length of the dipole, I never >>>> really >>>> had a problem with SWR (well, according to what the MFJ was saying, which >>>> may or may not be totally accurate.) Usually 1.5:1 or under on all bands. >>>> >>>> With the K2/KAT2 in place, the SWR reported by the tuner is all over the >>>> place. The only one that gets less than 1.5:1 is 30m. Most bands are >>>> pretty >>>> random, anywhere from 3:1 to 7:1. However, on 20 and 40, it generally >>>> does >>>> not get below 9.9:1. >>>> >>>> I've tried 4 different lengths of coax between the barrel (inside) and >>>> the >>>> rig... 3', 6', 12' 20'. I've tried a couple different lengths between the >>>> balun and the barrel on the outside. >>>> >>>> When I attach the balun directly to the K2 I get <1.3:1 on all bands >>>> (most >>>> are 1:1.) With a short piece of coax between the rig and the balun, I get >>>> the same results. I've also attached my dummy load to the barrel on the >>>> outside of the house, and tested it from the shack, and I saw 1:1 no >>>> problem. >>>> >>>> I totally understand the concept that if "A" works and "B" works, "A+B" >>>> doesn't necessarily work. I understand it's a whole system. But I've >>>> tried >>>> so many different combinations of coax on each side, and don't understand >>>> why my SWR is basically infinity:1 on 20 and 40, when they seemed to >>>> match >>>> reasonably with the old system. I have not tried different lengths of >>>> window >>>> line between the dipole due to the fact that I had it perfectly trimmed >>>> for >>>> my old system. But I have plenty of it and would be open to trying >>>> anything. >>>> >>>> Just trying to get the most I can out of my modest 10W. :) Any >>>> suggestions >>>> would be appreciated! >>>> >>>> 73, >>>> >>>> Dave >>>> K8DJW >>>> >>>> >>>> >>> ______________________________________________________________ >>> 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 >>> >>> >>> >> >> >> ------------------------------------------------------------------------ >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 9.0.725 / Virus Database: 270.14.142/2623 - Release Date: 01/15/10 >> 02:35:00 >> >> > ______________________________________________________________ > 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 > ______________________________________________________________ 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
