[BC] Part 15 LPAM Questions?

[Richard Fry]

>It is the extremely high reactance that is the problem.
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The high reactance is a problem, but even when it is canceled using an 
inductance at the feedpoint, the radiation resistance of a 3-meter 
conductor -- when the 3 meters includes the conducting path to an r-f 
ground buried in the earth -- is barely 1/10 of an ohm even in the X-band.

The r-f resistance in the ground connection of a typical Part 15 setup can 
be tens of ohms.  Antenna system efficiency is the ratio of the radiation 
resistance to the total of all resistances in the antenna system, so even a 
resonant Part 15 antenna system can have efficiencies of less than 1%, and 
many/most of the FCC-compliant ones probably do.

RF