On Oct 10, 2021, at 12:18 PM, Scott McDonald <ka9pscott@...> wrote:

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Steve, how long is your antenna, and how many pF is your cap?

Scott Ka9p

On Sun, Oct 10, 2021 at 1:36 PM STEVE via <behlmer=[email protected]> wrote:

Hope I’m not duplicating a previous feed. I’m using an end-fed 40-10 antenna. I have a very high voltage variable capacitor that I would like to incorporate for remote tuning. I can create a waterproof box for the capacitor,motor, etc. has this been done?? What about parts?? Thanks to the groups!!? You’ve taught me lots!!

On Oct 10, 2021, at 2:34 PM, Arv Evans <arvid.evans@...> wrote:

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Steve

I use an LC network to load a 55 foot end-fed wire for an original BITX,

and for my uBITX.? The inductor is a roller coil from an ARC-5 transmitter.

This with a Stockton bridge for SWR management lets me operate on

almost any band.?

If an adequate variable capacitor is not available, one can be fabricated from

blank PCB material.? It is also possible to use several fixed value capacitors

to tune just above each band and make a small variable cap to get lowest

reflected power on each band.

Several on this group have built stepper motor activated antenna tuners, and

a few have built DC motor tuners.? Most of these use an Arduino to manage

the tuner.

Arv

_._

On Sun, Oct 10, 2021 at 12:36 PM STEVE via <behlmer=[email protected]> wrote:

Hope I’m not duplicating a previous feed. I’m using an end-fed 40-10 antenna. I have a very high voltage variable capacitor that I would like to incorporate for remote tuning. I can create a waterproof box for the capacitor,motor, etc. has this been done?? What about parts?? Thanks to the groups!!? You’ve taught me lots!!