Richard Harrison wrote,

Maybe a flat coil is more equal than a solenoid. Were it of great
importance, Terman would have told us.


A flat coil should work fine as a capacitance hat.
73,
Tom Donaly, KA6RUH

A flat coil should work fine as a capacitance hat.

I have thought about trying this. With a spiral or flat coil you have a hat
and a loading coil all rolled up in one. Winding spiral coils is not easy, and
the mechanics of mounting on my mobile antenna have kept me from trying, but I
may yet. What do you think Tom?
73 Gary N4AST

Gary wrote,

A flat coil should work fine as a capacitance hat.

I have thought about trying this. With a spiral or flat coil you have a hat
and a loading coil all rolled up in one. Winding spiral coils is not easy,
and
the mechanics of mounting on my mobile antenna have kept me from trying, but
I
may yet. What do you think Tom?
73 Gary N4AST


Hi Gary,
it may not be worth all the work involved. I'm not an expert on
mobile antennas, so don't take anything I write on the subject too seriously.
On the other hand, there should be some current into the coil causing a
changing charge density at the other end which would, in turn, cause a
changing electric field in the vicinity of the antenna, which would cause
electromagnetic radiation, so you might see some improvement over
what you're using now, after all.
Try it out.
73,
Tom Donaly, KA6RUH

Tdonaly wrote:
On the other hand, there should be some current into the coil causing a
changing charge density at the other end which would, in turn, cause a
changing electric field in the vicinity of the antenna, which would cause
electromagnetic radiation, so you might see some improvement over
what you're using now, after all.

If the pancake coil is in the horizontal plane, it will probably
radiate horizontally polarized radiation and probably straight up.
--
73, Cecil http://www.qsl.net/w5dxp



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JGBOYLES wrote:
With a spiral or flat coil you have a hat
and a loading coil all rolled up in one. Winding spiral coils is not easy, and
the mechanics of mounting on my mobile antenna have kept me from trying, but I
may yet.

There was a magazine article a couple of years ago about such
in one of the ham rags - sorry, don't remember which one.
--
73, Cecil http://www.qsl.net/w5dxp



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Pancakes have been written about for a while in RADCOM of the U.K.
In Europe there is some experimenting going on below the
broadcast band but it is limited to a few watts.
The basket weave was mainly introduced to REMOVE the
intercapacitance of the coils and a capacity hat was
introduced immediately AFTER the inductor.
Because they were only using a few watts there was not a concern
regarding voltage breakdown, a concern that should be reviewed before
entertaining the idea at the end of a high powered whip !
Regards
Art



Cecil Moore wrote in message ...
JGBOYLES wrote:
With a spiral or flat coil you have a hat
and a loading coil all rolled up in one. Winding spiral coils is not easy, and
the mechanics of mounting on my mobile antenna have kept me from trying, but I
may yet.

There was a magazine article a couple of years ago about such
in one of the ham rags - sorry, don't remember which one.