David, I have seen several responses that suggest changes to your antenna setup, but not one that I can "warm up to".
The choice of a 1:1 balun vs. a 4:1 balun depends on the feedpoint impedance and has nothing to do with the fact that the characteristic impedance of the ladder line is 450 ohms - the impedance at the shack end of that feedline is what is important. If you do not understand what is going on, I direct you to the antenna article on my website www.w3fpr.com, I would strongly suggest that you measure the electrical length of the feedline plus the length of one side of the radiator for all bands of interest. Avoid those sum lengths that are close to a multiple of a half wavelength. Most autotuners do not have the range to work into the high impedance presented by a half wavelength - that goes for 1/2 of a dipole (plus feedline) as well as for an end fed antenna. 73, Don W3FPR On 10/26/2012 10:23 AM, David Bunte wrote: > Ron - > > This is not an area where I have much experience, but with 450 ohm ladder > line I would have thought you would use something other than a 1:1 balun. > > A few years ago I experimented briefly with an 80 meter dipole, fed with > 450 ohm ladder line. I tried it with a 1:1 balun and with a 4:1 balun. An > LDG AT-7000 tuned it very easily on 80 through 10 meters while using the > 4:1 balun... but had trouble on some bands with the 1:1 balun. > > Dave - K9FN > > ______________________________________________________________ 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
