Topbanders, R and J are:
Freq 1.820 R=54.6 jX=10.4 with dipole at operating height, connected to the system and tuned. R=35.0 jX=-4.8 with dipole at operating height and disconnected at shack end. R=16.2 jX=-35.6 with dipole disconnected and grounded. No chance now to put down the dipole , it's 11 pm local. Unmatching the dipole ( like setting the antenna tuner to a bad match) doesn't change much. Homing the elements of the SteppIR<>set to 20m also doesn't change much. So the dipole has a big impact on the shunt fed tower. Will remove the dipole tmw. and check again. Any ideas how to detune the dipole? Am 18.01.2011 22:19, schrieb W2XJ: > You really need to be able to measure R and J. Move the shunt connection > to establish the correct R and then tweak C to remove reactance. The > flatness of the antenna will in part be determined by tower height and > to a lesser extent the length and number of ground radials. > -- 73, Martin DM4iM _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
