Cecil, are you thinking of an open ended tube of Hg with a variable
supply of Hg?? My days with Hg manometers comes to mind.

If it's a closed tube then the length does not change with angle.

So, you can have your variable length antenna and not have it too!!

Deacon Dave

Cecil Moore wrote:

Jim Kelley wrote:

Cecil Moore wrote:

"Tilt" is very good advice for a variable mercury column.
In fact, the tuning length of the column of mercury could
be controlled simply by tilting the tube of mercury at an
angle away from vertical in the direction of horizontal.


How much does the length change when you tilt it at 45 degrees?


By the factor of the square root of two.
--
73, Cecil http://www.qsl.net/w5dxp



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