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Old December 21st 05, 03:12 AM posted to rec.radio.amateur.antenna
Roy Lewallen
 
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Default Antenna reception theory

Richard Harrison wrote:
Reg, G4FGQ wrote:
"Terman, Kraus, and Balanis and some computer programs are of no help!"

My dictionary defines "field strength" as:
"3. The strength of radio waves at a distance from the transmitting
antenna, usually expressed in microvolts-per-meter. This is not the same
as the strength of a radio signal at the antenna terminals of the
receiver."

The definition looks OK to me. The reason the signal is not the same as
the microvolts-per-meter even when the antenna is a 1-meter length of
wire with just the right slant is because the induced voltage gets
divided between the antenna and its load (the receiver).


No, that's not why. The terminal voltage of an open circuited 1 meter
(electrically short) dipole is 1/2 the field strength in volts/meter.
The terminal voltage when terminated with a conjugately matched load can
be well over a thousand volts (in the theoretical lossless case).

But it's pointless to keep repeating this. Reg keeps asking the same
question, and you keep responding with the same incorrect answers. I
believe I've gotten through to everyone who really wants to know the
answers, so I'll let this be my last repetition.

Roy Lewallen, W7EL
 
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