So, if I understand you right... Sorry about getting OT here. I can make it resonant by extending it about 1 foot on each end?
33 feet/x=7.09/7.3 x=~34 My main problem are junipers. I can raise the antenna about 20' in the air but then the antenna is literally in the trees. Would that create more problems that it solve? Ron D'Eau Claire wrote: > > 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 > > -- View this message in context: http://www.nabble.com/ATU-problem-or-Law-of-physics-problem...-I-don%27t-know-which-tp14555238p14561208.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
