[Elecraft] static buildup on antennas

Ron D'Eau Claire ron at cobi.biz
Mon Sep 10 14:31:42 EDT 2012


It gets tricky when the antenna feed point impedance is several thousand
ohms such as I see with my 130 foot inverted L on 80 meters or with the
common open wire fed multiband doublets. 

In those cases it's common to use a resistance of 100K or more to avoid
excessive losses in the resistors. 

But, such large resistances require more time to bleed off the accumulated
voltage. At some point they can no longer drain the charge as fast as it
accumulates and become ineffective.

My favorite "tuner" for such antennas has always been a link-coupled tuner.
No direct-current connection between the antenna and the rig and a d-c path
to ground for the antenna at all times. But such tuners are not conducive to
fast, automatic operation. 

73, Ron AC7AC




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