On 18 Jan, 04:36, "Lee" wrote:
"MGFoster" wrote in message

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I got some pretty good search results when I Googled "linear loaded
antenna". *You have to put the phrase in quotes to get best results. *My
search yielded about 193 results.

Yes, thanks i did the same with the same result except that i didn`t use
quotes .... i`ll try that anyway...
The results i got weren`t very helpfull, i did a search of this NG....

There's an antenna called the "Cobra Junior"
www.vk1od.net/cobra/index.htmthat may be of interest.

Yes i saw that, very nice.

Of course Cibek has a very technical discussion of various loaded
antennas. *I usually just read the last paragraph summaries to find out
what he's driving at. *www.cebik.com/gp/linvert1.html

That`s where i have problems.

Here's a good short description of linear loading - I believe the ASCII
graphic is accidentally end-wrapped. *lists.contesting.com/_topband/2002
09/msg00030.html

Here's a description of a portable linear loading antenna:
http://www.io.com/~n5fc/notebk_ant.htmthat seems good for moderate
distances.

I wish to build single band dipoles not needing an atu......
I was thinking along the lines of a 28meg dipole with loading wires to 20
meters
below the main element spaced approx 6 inches as a starter, along the lines
of a
shortened vertical.......

Thanks for reply.

Cheers..

Len ....G6ZSG.......

LEE.
First get a hoola hoop from ASDA or a hose pipewith which you can make
your own

Get a similar diameter former and wind wire on it close wound first in
one direction and then reverse the windings on top of the first
windings. Slide this on the hula hoop and then stretch it out like a
fish net. The length of the wire must equal or exceed the wave length
of the frequency required. You have two wire ends at the same point
with which you can supply power. The wound wire is infact a loop
circuit of its own and you can stretch it out using a MFJ 259 until
you hit the sweet spot. Impedance will be around 20+ ohms which
increases with the number of wavelengths used Note that the inductance
is cancelled by the reverse turns and the capacitance is cancelled by
the cross winding.Tho the antenna covers little area apurture is
covered by gain, the loop with its inherrant gapaqcitive positioning
creates an electric field that extends beyond its physical shape. You
see this effect in a mobile when the audio increases as you drive by
power lines and the like.
Cheers and beers
Art Unwin KB9MZ....XG (uk)