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Old August 15th 05, 09:11 PM
Frank
 
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Put up 66 ft of wire, or any length that is convenient. Wire length is
unimportant. Inverted vee is ok. Feed it with open wire line (Or 450 ohm
ladder line) an any point you like. It will work just the same as a full
sized dipole. Do not use any coax in the feedline, losses can be very
high, even with very short lengths. You do need a well designed tuner,
with low losses. Fairly high voltages will be present at the output of
the tuner.

Regards.

Frank


As an example on 3.8 MHz: 66 ft of #14 AWG wire, fed in the center, 30 ft
high above average ground Er = 13 Sigma = 5 mS/m. Radiation efficiency
96%. Fed with 50 ft of 600 ohm open wire line: input impedance = 748 +
j2087 maximum voltage at feedpoint, with 1.5 kW input, 3.05 kV. Series C,
shunt L tuner, with inductor loaded Q of 200. Tuner Loss = 0.24 dB.

Frank