I'm considering using an end-fed halfwave for Field Day, and I have an idea how I might implement it, but need some technical assistance from those in the "know".
What I'd like to do is pick up a few toroid cores (one to break, one to lose, and another to use) to build a simple transformer with a couple turns attached to a short (2-3 ft) pigtail of coax going back to the K2/KAT2. I'm hoping I can experimentally determine how many secondary turns to use for the halfwave side of things. Will the KAT2 be sufficient to handle the 'fine tuning' after I handle the major impedance transformation through the toroid? or will I need to get my hands on an air variable to do fine tuning on the antenna end of the pigtail? Any ideas on how to best implement this would be greatly appreciated - especially since I'll need to know which core(s) to buy this week so I can test this out before Field Day. If there's a cheaper way to do this using simple plastic pill bottles and air wound cores - I can do that too ... but I also like to wind toroids ;-) I'll probably end up with 1 or 2 antennas ... a 40/20/15 (40m halfwave), and maybe an 80/40/20 (80m halfwave). I may try to orient these crosswise to provide E-W coverage on 80/40/20 and N-S coverage on 40/20/15 - knowing that both of these antennas will start producing interesting lobes on the shorter wavelengths. Thanks for any help this list generates... 73, Daniel AA0NI Oklahoma City http://www.aa0ni.org _______________________________________________ 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
