Rewinding a rheostat to make it a variable iunductor
 

I came up with this idea to make a tiny antenna tuner. Thought maybe I
could remove the wire on a rheostat and rewind it with copper wire so I
can make a long wire antenna tuner .

Dennis W6EH

Rewinding a rheostat to make it a variable iunductor
 

On 17 Sep 2006 04:58:06 -0700, wrote:

I came up with this idea to make a tiny antenna tuner. Thought maybe I
could remove the wire on a rheostat and rewind it with copper wire so I
can make a long wire antenna tuner .

Dennis W6EH

Check a back issues of QST. Someone did it (miracal antenna)
in a construction article.

They wrapped a ferrite toroid (large one) and use the wiper and
bearing from a Wire wound rheostat to select taps on it. I tried it
for a very small Pi tuner and it was decent.

Allison

Rewinding a rheostat to make it a variable iunductor
 

wrote:
On 17 Sep 2006 04:58:06 -0700, wrote:

I came up with this idea to make a tiny antenna tuner. Thought maybe I
could remove the wire on a rheostat and rewind it with copper wire so I
can make a long wire antenna tuner .

Dennis W6EH

Check a back issues of QST. Someone did it (miracal antenna)
in a construction article.

They wrapped a ferrite toroid (large one) and use the wiper and
bearing from a Wire wound rheostat to select taps on it. I tried it
for a very small Pi tuner and it was decent.

Allison

ARRL members can download the article @
http://www.arrl.org/members-only/tis...df/0107032.pdf

This ideas was commercialized by the author and is now sold as the
Miracle Whip
See http://www.miracleantenna.com/ for details

Roger

Rewinding a rheostat to make it a variable iunductor
 

Hmmm...not a bad idea. I have no use for a Miracle Whip antenna, but
I think I'll try that approach as another alternative to Phil Salas,
AD5X's portable vertical base matching techniques. It might even be
feasible for the tuneable component of a center loading coil. I'm
gonna do some experimentin'!

73,
On 17 Sep 2006 04:58:06 -0700, wrote:

I came up with this idea to make a tiny antenna tuner. Thought maybe I
could remove the wire on a rheostat and rewind it with copper wire so I
can make a long wire antenna tuner .

Dennis W6EH