DC shorting a Screwdriver antenna?
 

Has anyone ever seen or tryed DC shorting a screwdriver type antenna?


--
Registered Linux User #346565
http://www.tblx.net
WA5K

Jeremy Salch wrote:
Has anyone ever seen or tryed DC shorting a screwdriver type antenna?

The parallel coil at the base, active on the lower bands to raise
the feedpoint resistance, provides a DC short automatically.
--
73, Cecil, http://www.qsl.net/w5dxp



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Cecil Moore wrote:

Jeremy Salch wrote:
Has anyone ever seen or tryed DC shorting a screwdriver type antenna?

The parallel coil at the base, active on the lower bands to raise
the feedpoint resistance, provides a DC short automatically.
--


Hmm, Ok then maybe i'm not asking the correct question. I was thinking if
there is a way to make a screwdriver antenna appear or act like a "loop"
style antenna in which the radiator is connected to ground creating a "dc
short"

At my previous residense I had a large loop antenna and i was always
impressed with how low of noise level it had in comparison to other
antennas.



--
Registered Linux User #346565
http://www.tblx.net
WA5K

On Wed, 14 Apr 2004 13:12:25 -0500, Jeremy Salch
wrote:

Hmm, Ok then maybe i'm not asking the correct question. I was thinking if
there is a way to make a screwdriver antenna appear or act like a "loop"
style antenna in which the radiator is connected to ground creating a "dc
short"

At my previous residense I had a large loop antenna and i was always
impressed with how low of noise level it had in comparison to other
antennas.

Hi Jeremy,

A large loop? From the radiator out and back to the ground mount?
Most short loops need capacitance (kinda the inverse of short
monopoles need inductance - hence the utility of screwdrivers). For a
larger loop, you may need additional components (dare I suggest
capacitors again?); but if you didn't give it a try, then you might
lose your amateur status; any way, you can attach a cap anywhere for
a quick-see.

73's
Richard Clark, KB7QHC

Jeremy Salch wrote:
Hmm, Ok then maybe i'm not asking the correct question. I was thinking if
there is a way to make a screwdriver antenna appear or act like a "loop"
style antenna in which the radiator is connected to ground creating a "dc
short"

Assuming the screwdriver antenna is mobile, a full-wave loop
is hard to come by. I have heard of such being attempted using
gigantic capacity hats but I haven't seen any in action.
--
73, Cecil http://www.qsl.net/w5dxp



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