[Lf] [Fwd: LF: Static discharge]

[Andre' Kesteloot]

Tom Boucher wrote:

> In message <2000053009081868199 at zetnet.co.uk>, Peter Dodd
> <g3ldo at zetnet.co.uk> writes
> >Most of the istallations  used by the LF group (and including the one
> >at G3LDO) use a loading coil/tuning variometer/matching transformer
> >arrangement that provides a DC path to ground so a large static build
> >up does not occur.
>
> Peter,
>
> I am not sure that this is so. I used to use a tapped loading coil
> arrangement with the bottom end grounded but after a discussion with
> David G0MRF at Windsor last October, changed this to a simple series
> loading coil which works just as well.
>
> David's theory was that in the case of the grounded coil, should the
> antenna go off resonance for any reason, the impedance presented to the
> transmitter will go very low and probably blow up the Tx. With a simple
> series coil, if the antenna goes off tune, the impedance will rise and
> not overload the Tx. However, there is no static discharge path.
>
> Another subject - I had a nice 136 KHz QSO yesterday with Howard G3RXH
> in Skipton who was receiving me on an AR88-LF. One more for your list of
> LF receivers!
>
> 73, Tom G3OLB.