[Lf] Automatic ATUs]

[Andre' Kesteloot]

Steve Rawlings wrote:

> Bob ZL2CA wrote:
> > . . . . Once the
> > LF antenna has been "tuned and matched" using the likes of a (big)
> > loading coil with taps or L match, the relatively small variations in
> > reactance with changing conditions could be handled with a motor driven
> > variometer (say 50 uH range). . . . .
>
> I have been using such a fine-tuner on 136 kHz for several months with
> great success.  Although not 'automatic' in operation, the tuner is
> remote- controlled, and enables rapid changes in operating frequency to
> be made.
>
> Details of the general arrangement can be found at:
> http://www.alg.demon.co.uk/radio/136/rem_vario.htm
>
> Regards to all,
> Steve GW4ALG