Cecil Moore wrote:

Andy Cowley wrote:

If you get the wrong feedline length and aerial length combination you
can quickly get solutions which, even when in range, produce excessive
voltages at 100W.

My point was that the wrong feedline length yields the same results for
a 60 ohm antenna as it does for a 6000 ohm antenna. If you feed that
60 ohm antenna with an odd multiple of 1/4WL of feedline, the impedance
seen at the tuner will be 6000 ohms. If you feed the 6000 ohm antenna
with a multiple of 1/2WL, the impedance seen at the tuner will be 6000
ohms. The impedance of the antenna doesn't really matter as long as it
is 1/2WL on the lowest frequency of interest. What matters is the SWR
on the feedline and the length of the feedline. The feedpoint should be
in the ballpark location of the current maximum point, not the voltage
maximum point.

My statement is assuming 600 ohm open-wire feedline as specified earlier.
--
73, Cecil http://www.qsl.net/w5dxp



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