Frank wrote:
The nominal impedance of a 40 m dipole on 20 m, at 30 ft above an average
ground, is
4700 + j0. There may be some inductive or capacitive reactance present --
depending on the exact length of the antenna -- but it will not effect the
transmission line losses significantly.

100 ft of RG 58 exhibits a total line loss of about 13 dB when terminated
with the above impedance. i.e. 100 W in gives 5 W radiated.

While 1/4WL (or 3/4WL or 5/4WL) of 450 ohm ladder-line yields an
impedance at the transmitter of 43 ohms for a 50 ohm SWR of 1.16:1
without a tuner and very low line losses. What could be sweeter?
--
73, Cecil http://www.qsl.net/w5dxp

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