That certainly sounds like a problem induced by RF Feedback from the multiband antenna. Just as thought, perhaps a bit longer length of coax to your 4:1 balun might be in order. L B Cebik suggests a scheme for using open-wire feed - run coax through the wall to the outside and install a 1:1 ferrite bead type balun (note NOT a 4:1 balun) on the outside.
A point of information that many folks seem to have trouble with is that the output of the balun must match the feedpoint impedance of the transmission line, and that has little to do with the characteristic impedance. Just because you are using a 600 (or 450) ohm feedline does not imply that a 4:1 balun should be used - in most cases, a 1:1 balun will do a better job across all bands. 73, Don W3FPR > -----Original Message----- > John- > I worked SS contest last night (SSB) and had a similar problem > running at 100+ watts with my K2-100 and the KAT tuner. I had a > difficult time getting a match when in high power (anything above 11+ > watts). When I transmitted, the KAT-100 would switch to "Ant #1" for a > second before switching to "Ant #2" which is what I had selected (#2). > #1 is my tri-band beam and #2 is my 135' dipole fed with open-wire > feedline with a 4-1 balun near the KAT-100. > _______________________________________________ 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
