Such a low dipole will normally have, at its center, an impedance in the general range of 4-j60 ohms at 7 MHz, so the "r" value you're seeing doesn't seem surprising.
For all practical purposes it's "on" the ground and the earth has a very large effect on its impedance and its resonant frequency. In that case it's closest to resonance at about 7.3 MHz where the impedance will be close to 4.7+j0 ohms. The SWR bandwidth is very broad because of the huge resistive losses of the earth. Even so, it should show pretty good performance as an NVIS radiator for local contacts. You didn't mention the type or length of feed line. Since it has a high SWR, it will have a huge effect on the impedance the KX1 sees. For example, if it's 50 ohm coax the SWR will be something like 33:1. By comparison, the same antenna at 30 feet up will be self resonant at about 7.1 MHz where it will show an impedance of 70+j0 ohms, giving you an SWR of less than 1.5:1 when fed with 50 ohm coax. Ron AC7AC -----Original Message----- Hmm.... I have a 66' (20m-ish) center fed dipole at 6 feet off the ground in my back yard. The ATU in my KX1 reads P 0.3 and r9.9 at 7090 khz. This doesn't look right to me. Did I dork something up when I twiddled the knob? -- View this message in context: http://www.nabble.com/ATU-problem-or-Law-of-physics-problem...-I-don%27t-kno w-which-tp14555238p14555238.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ 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
