Stefan Schäfer wrote:
My Conclusion: It seems that a short receiving antenna can bee seen as a
capacitive divider out of the capacity between far field and antenna and
the capacity between antenna and ground. If the wire length is to much,
the input stage becomes nonlinear/goes into saturation. If the height
above ground is increased the signal comes up, but not the signal/noise
ratio(surely there will be a benefit if such an antenna is placed in a
region with heavy local qrm. Then, the height should be increased and
the wire length can be decreased). So, one cannot say “the more the
better” talking about the wire length!
It would be quite interesting if somebody could try to use, instead of a wire,
something
with a greater capacity towards ground, e.g. a can of beer (after drinking the
beer, of course...:-)
One of half liter (slightly more than 1 pint) could do, I think...
Maybe the increased capacity towards ground could make it more effective than a
wire
73 Alberto I2PHD
P.S. And the entire active antenna circuitry could be placed inside the can...
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