I have been thinking of doing the same thing, but good for 600 watts of AM carrier plus modulation. I would wind the coils out of copper tubing, and make the coils tapped with a switch, only the best roller inductors hold up over time. The coils would have a link input from the rig side.
http://www.cebik.com/link/link.html Sort of like the old Johnson matchboxes. They also had a switch instead of a roller inductor, the roller allows too wide a range, its sometimes hard to repeat settings as there are to many variables. I have a heathkit tuner now with the roller inductor, and its a real pain, a switch for the band would be better, even though the match might be slightly off. Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Don Ehrlich > Sent: Thursday, September 06, 2007 6:05 PM > To: Lamb, Dick & Judy; Roelof Bakker > Cc: Elecraft@mailman.qth.net > Subject: Re: [Elecraft] K2, KAT2 and displaced choke balun feed > > I had to design and build my own because I wanted to run up > to a KW through > it. If I had to buy new matched roller inductors they alone > would cost over > 400 dollars. > > I found most of what I needed in my junkbox or on Ebay but > even so the parts > and materials alone were well over 300 dollars ... and I laid > out and built > my own circuit board, bent my own aluminum, and made many component > compromises. Any commercially built balanced autotuner for > a KW would be > *very* expensive. Many hundreds of man-hours later for > construction and > software programming have finally got me what I wanted and I > am very happy > with it. But I don't ever expect to see one on the market > that is easily > affordable for most hams. > > Don K7FJ > > ----------------------------------------- > > However, it would be so nice to have a wide-range balanced > autotuner. I > > couldn't find one on the amateur market. > > > >> Though this works for me at the moment, it should be nice > if someone > >> (Elecraft?) could come up with a stand alone truely > balanced automatic > >> antenna tuner. > >> > >> 73, > >> Roelof Bakker, pa0rdt > >> Middelburg, Netherlands > >> JO11tm > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
