As long as the balanced line isn't resonant, you should be OK. I use 61 feet here (18.6m) and it works fine from 2.8 MHz up. The doublet is 150 feet, total length. So far I haven't found a freq that the K3's ATU cannot tune, and that includes many MARS channels outside and between the U.S. Amateur bands.
73, matt W6NIA On Thu, 15 May 2014 20:22:39 +0100, you wrote: >Hello, > >Does anyone use a 270 foot doublet with the K3 ATU? > >Is there a combination of feeder type/length and Balun type & coax >length that tunes OK on 160-10? > >I am currently thinking a 1:1 balun and 33 foot of 300 ohm feeder. > >Obviously the coax length should be short but too short may cause rfi >probs, but then I only run 100W. > >Iain G4SGX > > >--- >This email is free from viruses and malware because avast! Antivirus >protection is active. >http://www.avast.com > >______________________________________________________________ >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] Matt Zilmer, W6NIA -- "Give me six hours to chop down a tree and I will spend the first four sharpening the axe." -A. Lincoln ______________________________________________________________ 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]
