On Sat, 17 Apr 2004 15:21:14 +0000 (UTC),
wrote:

Not to mention the small problem that your antenna would contain a
spark gap...

Hi Jim,

100 years ago they all did. And of course, the bands weren't as
crowded then (and VHF started around 2 or 3 MC).

Who would have thought....

73's
Richard Clark, KB7QHC

First thought is that it would heat up and detune itself. But this would
only be a problem on transmission and if the tube holding the mecury was
very thin. Conductivity of mercury is not so great compared to more
traditionally used metals but this should not be significant compared to the
radiation resistance of most antennas.

"Cecil Moore" wrote in message
...
Forget about the feasibility of this question for the moment.
Could a column of mercury inside a tube of glass be used as an
antenna?
--
73, Cecil, W5DXP



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On Sun, 18 Apr 2004 18:04:22 GMT, "Jimmy"
wrote:
First thought is that it would heat up and detune itself. But this would
only be a problem on transmission and if the tube holding the mecury was
very thin. Conductivity of mercury is not so great compared to more
traditionally used metals but this should not be significant compared to the
radiation resistance of most antennas.

Hi Jimmy,

There are so many things wrong with this sentiment....

For one, this "tube of mercury" (that everyone takes for granted) to
be "tuned" by temperature would have an exceedingly small capillary
(my lab models are easily less than 1mm). Second, constructions of
wavelengths longer than for 2M are laughable (but then, so is the
entire concept). You could never support the column within it as it
would draw a vacuum in its collapse under the influence of gravity
(AKA barometer). Try to counter that with a thinner capillary
(anyone see where this is going in comparison to radiation
resistance?) and almost any heat expansion will rift the enclosure.

When do we get to depleted uranium elements that pre-ionize the æther
around them for "matching?" Will it escape the notice of many that we
would have to then abide by exposure rules from both the FCC and the
Nuclear Regulatory Agency? Or even the NIH?

73's
Richard Clark, KB7QHC

Richard Clark wrote:
Second, constructions of
wavelengths longer than for 2M are laughable ...

For a horizontal antenna???
--
73, Cecil http://www.qsl.net/w5dxp



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On Sun, 18 Apr 2004 14:41:28 -0500, Cecil Moore
wrote:

Richard Clark wrote:
Second, constructions of
wavelengths longer than for 2M are laughable ...

For a horizontal antenna???
keep the chuckles comin'

Richard Clark wrote:

wrote:

Richard Clark wrote:
Second, constructions of
wavelengths longer than for 2M are laughable ...

For a horizontal antenna???

keep the chuckles comin'

You know I don't care for verticals. :-)
--
73, Cecil http://www.qsl.net/w5dxp



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That IS funny!!!

Everybody knows vertical mercury antennas perform better than horizontal
ones!!!

;-)

Most certainly idle minds will play...

"Richard Clark" wrote in message
...

Hi Jimmy,

There are so many things wrong with this sentiment....

Well, since I have a rather large container of the stuff (a couple of
lbs) looking at me all the time on top of my o-scope, it sure is tempting
.... just to say it was done...

...You could never support the column within it as it
would draw a vacuum in its collapse under the influence of gravity
(AKA barometer).

OOPS. Tilt... Er...uh. Don't build it like that. Cap the bottom to fix
this. Leave a little air/vacuum/(a.k.a. mercury vapor) on top if you must
use a glass tube.

.... I wonder what kind of tubing I have around here...
--
Steve N, K,9;d, c. i My email has no u's.

Steve Nosko wrote:

Most certainly idle minds will play...

"Richard Clark" wrote:
...You could never support the column within it as it
would draw a vacuum in its collapse under the influence of gravity
(AKA barometer).

OOPS. Tilt... Er...uh. Don't build it like that.

"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.
--
73, Cecil http://www.qsl.net/w5dxp



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Cecil Moore wrote:

Steve Nosko wrote:

Most certainly idle minds will play...

"Richard Clark" wrote:
...You could never support the column within it as it
would draw a vacuum in its collapse under the influence of gravity
(AKA barometer).

OOPS. Tilt... Er...uh. Don't build it like that.

"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.
--
73, Cecil http://www.qsl.net/w5dxp

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

ac6xg