On 8/8/05, Stuart Rohre <[EMAIL PROTECTED]> wrote: > This was done for a floating system, or a closed system, ie dipole in space, > no other ground. That would pretty well approach the floating system you > have used on rock. >
Well, my thinking went like this: Imagine I connected a 3/4 wavelength wire to the ant output on the KX1, and a 3/4 wavelength counterpoise to the rig's chassis (which is floating with respect to ground). A current maximum would exist at the 2 points of attachment and equal and opposite currents would flow into the two wires. Now if the first 2/3 of each wire were paralleled to form a transmission line with the remaining 1/3 arranged to form a dipole antenna, nothing really changes except that now only the dipole elements radiate, since the currents on the 2/3 of the wire formed into a transmission line are (still) equal and opposite in phase. The system remains balanced with respect to ground, by virtue of the fact that the chassis is floating. As noted by others, this arrangment does have a drawback - RF voltage will be present on the chassis. I hadn't thought about that. Since I'm using resonant dipoles with balanced feedlines cut to 1/2 wavelength the voltages probably aren't that high, but upon reflection I can see why the balun would be nice to have for that reason alone. Oh well, just an oz. or two more weight to carry if I want to use one. Thanks all, Bob NW8L _______________________________________________ Elecraft mailing list Post to: [email protected] 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
