My antenna is 137 ft CF with about 50 ft of 450 ohm ladderline terminating into a 9 to 1 balun with about 20 ft of coax to the K2/100/KAT100. It works great---1 to 1 VSWR 160 through 10 meters. However to get a decent VSWR at the low end of 80 Meters, it is necessary to hit the tune button at approximately 3600 Khz then tune down about 6 Khz at a time, hitting the tune button, step by step to get to the low end of the band. Once there I can go to other bands, then come back to the same 80 Meter frequency and still get the 1 to 1 VSWR. If I would hit the tune button say at 3570 Khz, then go back to the low end I would end up with about a 3 to 1 VSWR. It would be necessary to creep it down again. A 4 to 1 balun exhibits the same condition. Adding 20 ft of ladderline made no appreciable difference. Adding 3 ft of coax eliminated the problem, but messed up other bands. I feed the coax to the center coil of the trifilar winding with the ladderline tied to the outer ends of the other windings.
This problem was not experienced when I had the balun in the shack, but put it outside to get rid of RF in the shack. So, the tuner is capable of tuning whatever the impedance is at the low end of 80, but for some reason it needs help to get there. Would appreciatel any comments. 73, Lowell, W5FH _______________________________________________ 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
