Fred W4JLE wrote:
Once that was accomplished all the plots were in agreement with
the predicted except on 40 meters. Predicted should have been 7.3, actual
was 6.8 MHz. Easy enough to correct for, but have not yet figured out what
causes it. All other freqs were spot on.

What causes it is the feedpoint impedance of a one wavelength
dipole is very high and therefore easily upset by the surroundings.
A low impedance feedpoint impedance is not easily upset by the
surroundings. It's the same concept as using a 20k ohms/volt
voltmeter to measure the cathode voltage or the screen voltage
of a tube. One will give correct results and one won't.
--
73, Cecil http://www.qsl.net/w5dxp


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