My K1 with atu was just recently completed. Like you, I have plans for portable ops.
So far, I have only ventured out into the back yard with various wires flung over the trees, hung from the second floor balcony, etc. The antenna showing the best promise is the classic end-fed half wave Zepp. I've only made one so far - cut for 20 meters. It consists of a half wave radiator fed by a 1/4 electrical wave length of 300 ohm TV twin lead. One of the twinlead wires is connected to the half-wave radiator, and the other is unterminated. At the rig, both of the twinlead conductors are connected to the RF output via a BNC to binding post adapter. The 1/2 wave of twinlead serves to significantly reduce the feedpoint impedance, allowing the KAT1 to do its job without a balun, or an external tuner. Does a bang-up job on 20! I have also loaded this antenna up sucessfully on 40 and 30 meters. On 30 and 40 I tried it in various configurations - ground side of the twin lead disconnected, ground side of the twin lead disconnected and tied directly to earth ground, an additional semi-random length counterpoise added to the rig ground, etc. The K1 and KAT1 have so far managed to load up and produce good QSOs in every configuration. That chunk of twinlead is doing some genuine mojo. I have yet to make any defendable measurements of SWR, Impedance, etc. other than those provided by the KAT1. Frankly, the accuracy of the KAT1 SWR and power output indicator does not impress me as being of much value beyond a go or no-go status. Carl WA7CS -- View this message in context: http://www.nabble.com/K1%2C-KX1%2C-K2-antenna-tuner-high-impedance-feed-capabilites-tp15605647p15613470.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ 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
