Okay, some more info. The KPA500 does not have a problem with the inverted vee for 40 meters, but I will set it up with a dummy load to check just in case. And I will try the dummy load at the antenna end of the coax as a test tomorrow.
The antenna is the new Q-52 2 element yagi five band from N6BT. It uses relays on both the driven element and the reflector to cover 20m (high and low) 17, 15, 12 and 10. I have contacted Tom Schiller who says he has tested the antenna with 600-700 watts on CW so power should not be a problem. I also thought the high power might somehow be keying the relays as the eight-wire control cable parallels the coax 4 feet across the boom, down the 30 foot mast in through the garage in a pvc conduit then into the shack. I tried moving the control box away from the amp and experimented with running the coax a different route into the shack, although the coax and control cable still came down the mast next to each other. None of these had any affect. ..mike AI6II -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-KPA500-SWR-jumps-up-with-5-second-key-down-tp7557071p7557079.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
