In a message dated 6/17/05 2:12:37 AM Eastern Daylight Time, [EMAIL PROTECTED] writes:
> Wayne N6KR wrote: > > "...what you > described won't work very well, because both wires need to be about 33 > feet long at this frequency. By cutting one 33-foot piece of wire in > half, you've made a 20-meter antenna :)" > > -------------------- > > A modeling program like EZNEC predicts that a 33-foot center fed wire will > show a gain of about 6.9 dbi on 7 MHz and about 7.1 dBi on 14 MHz. That's > essentially no difference at all. > > Of course, that assumes no difference in matching network losses, which I'd > not expect a KX1 user to see using such an antenna without a feed line. (Of > course, if a coaxial feeder is used, then some means to holding down the SWR > on the feedline is very important to avoid losses there.) > > There's more to it, though: On 40 meters, the feedpoint impedance will look like a resistance of a few ohms and a reactance of several hundred ohms or more. Will the matching network be able to handle that, and do it without undue loss? 73 de Jim, N2EY _______________________________________________ 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
