On 6/9/2020 1:21 PM, [email protected] wrote:
anywhere then you either need a long vertical plus good ground as
mentioned already
WRONG. An end-fed wire needs a COUNTERPOISE, not a connection to mother
earth. A counterpoise is a low resistance conductor that provides a
return for the current and the field produced by the "intentional" part
of the antenna, and the counterpoise IS a part of the antenna. Salt
water IS an effective counterpoise because it is a good conductor; fresh
water is NOT, because it is NOT a good conductor, so it burns
transmitter power.
Likewise, a ground rod is a lousy counterpoise, because the earth is a
big resistor, and can easily burn much more than half the transmitter's
power. Radials serve as both a counterpoise and a shield ("screen" in
British English) -- they shield the field from lossy earth AND serve as
a return for the current and the field.
73, Jim K9YC
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