Hello all,
several observations have been reported so far (including my own) that
parallelling of different LF grounds do not always improve antenna current but
even may reduce it, de facto increasing the ground resistance.
In our LF Forum during the Ham Radio at Friedrichshafen I have also raised this
point in my speech and have mentioned as a possible explanation, that LF grounds
of any kind may not be regarded as pure real resistances, which could be
paralleled without any problems. Perhaps they must be regarded as komplex
resistances, combining real and reactive elements, be it inductive or
capacitive. Such ground could be paralleled sucesfully only after the reactive
elements have been tuned out.
This hypothesis had been the outcome of a discussion on these observations with
a swedish radio amateur (Bo Lindell, from Ericsson) which I have met at ETSI.
Any further observations and results on this topic would be appreciated.
Also nice to mention: When I raised this point on a local club evening meeting,
a grey-haired OM gave me an old-fashioned foil dielectric variable capacitor of
12.000 (twelve thousand) pF! This was really a good help to investigate this
problem.
73 Ha-Jo, DJ1ZB
Koenig, Wolfgang schrieb:
Hallo Group,
Yesterday I installed abt. 20 radials (10-35m) to my antenna system. But
there was no significant change of the antenna current. The current is abt
.6 A with and without the redials. Can anyone explain this?
73 Wolf (DL1SAN)
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