[Elecraft] static buildup on antennas

[Don Wilhelm]

Yes, link coupled tuners will solve a lot of those problems.  There is 
no DC path from the antenna to the transceiver.
However, those link coupled tuners have been disappearing from the face 
of the earth at a rapid rate.  They are not easily band-switched (the 
Johnson Matchbox units were an attempt, but the matching rang was limited)/

73,\
Don W3FPR


On 9/10/2012 2:31 PM, Ron D'Eau Claire wrote:
> 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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