Hi George, If your interested in sharing, I would be interested in your config for your tuner. I built a form of the remote "balanced-balanced" tuner for a 135' doublet a few years before remote tuners came out on the market. It didn't not have the ability to tune up/dwn within each band. Only the ability to switch to one pre-set set-point for each band. I controlled it with a PIC inside the house activating an old stepper switch. It was primarily a split coil ( one series coil on each side of the ladder line ) and a cap between the two, with tapped points for coil and separate caps for each band.
Later on I found out that a simple L-network would work just as well and I've been using that config ever since. With that doublets characteristics, I found that 10uh was all I needed for the "L" and 2000pf was the max I needed for the "C". I'm CW only, so in the upper bands the bandwidth was sufficient. But on 40, 80 and 160, "C" adjustment would be needed for the full spectrum of the CW portion @ low swr. I'm in the process of acquiring parts for an updated unit that handle a kw. So I'm curious on how anyone is building remote tuners these days :) Thanks Duane N1BBR -- [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
