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Old February 14th 08, 06:05 AM posted to rec.radio.amateur.antenna
Owen Duffy Owen Duffy is offline
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First recorded activity by RadioBanter: Dec 2006
Posts: 1,169
Default High ohm connections

MGFoster wrote in
:
....
The person who stated that "high ohmic connections" were deleterious to
QRP ops was describing his construction of a linear loaded dipole and
the connections to the inductance section of the antenna (see N5ESE's
article on the "Notebook antenna"
http://www.io.com/~n5fc/notebk_ant.htm). This is a small radiation
resistance antenna and could be affected by bad connections.


I had a look at that article, and have concerns about many things stated,
and the way in which the author distances himself from some of what is
said.

The effect of linear loading is that the contribution to radiation of
current in a segment of one section of the linear loading is offset to
some lesser or greater extent by the currents in parallel segments. The
heat loss is incurred by the current flowing in all the conductors, but
the radiation effect is diminished.

This mechanism can increase the loss resistance more than it increases
the radiation resistance.

This is contrary to the widely held view that linear loading is
essentially lossless.

Owen