Hi..

I wish to build shorty dipoles for 20 and 80 meters and have considered coil
loaded but dismissed them as too narrow band so i`m considering linear
loading
for b/width and space ...(my garden is 14ft x 35ft )...

I find my homebrew magloops r/x very well but don`t t/x too good!!! hence
the need for a larger directional ant on the rotator without encroaching on
neighbours space ....(too much) .... ;o)

I have googled, but there isn`t much info available and what there is, is a
little
too technical for me to take in.. /

Is anyone familiar with the merits (or otherwise) + information and s/ware
for
designing and building said antennae ?? all help and pointers welcome.

Thanks..

Len....G6ZSG.....

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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.

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

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

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.htm that seems good for moderate
distances.

73
--
MGFoster:::mgf00 at earthlink decimal-point net
Oakland, CA (USA)
** Respond only to this newsgroup. I DO NOT respond to emails **

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Lee wrote:
Hi..

I wish to build shorty dipoles for 20 and 80 meters and have considered coil
loaded but dismissed them as too narrow band so i`m considering linear
loading
for b/width and space ...(my garden is 14ft x 35ft )...

I find my homebrew magloops r/x very well but don`t t/x too good!!! hence
the need for a larger directional ant on the rotator without encroaching on
neighbours space ....(too much) .... ;o)

I have googled, but there isn`t much info available and what there is, is a
little
too technical for me to take in.. /

Is anyone familiar with the merits (or otherwise) + information and s/ware
for
designing and building said antennae ?? all help and pointers welcome.

"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.htm that 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.htm that 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.......

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)

"art" wrote
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.
______________

More likely it is due to the collection and re-radiation of fields by nearby
conductors, so as to increase the net field arriving at the mobile antenna.

RF

On 18 Jan, 07:21, "Richard Fry" wrote:
"art" *wroteTho 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.
______________

More likely it is due to the collection and re-radiation of fields by nearby
conductors, so as to increase the net field arriving at the mobile antenna..

RF

Exactly. The antennas electrical field is larger than its physical
size.

"art"
Exactly. The antennas electrical field is larger
than its physical size.
_________

My comment concerned a mobile antenna coupling into nearby conductors.

Are you saying that this is the basis for increased gain from your 160-m,
gaussian, compact, full-wave, tank circuit, tilted antenna in equilibrium?

RF

On 18 Jan, 08:48, "Richard Fry" wrote:
"art" Exactly. The antennas electrical field is larger
than its physical size.

_________

My comment concerned a mobile antenna coupling into nearby conductors.

Are you saying that this is the basis for increased gain from your 160-m,
gaussian, compact, full-wave, tank circuit, tilted antenna in equilibrium?

RF

And what is "THIS"?

And what is "THIS"?
____________

Rewritten to clarify for "art"

Are you saying that coupling from your 160-m, gaussian, compact, full-wave,
tank circuit, tilted antenna in equilibrium into randomly located conductors
near the transmit antenna is the basis for increased gain from that antenna?

Such random couplings ARE the reason for the increased signals you mentioned
in your earlier statement, "You see this effect in a mobile when the audio
increases as you drive by power lines and the like," and it appears you are
claiming that effect to explain the performance of your 160-m, gaussian,
etc, etc antenna in equilibrium.

Please explain.

RF

On 18 Jan, 09:16, "Richard Fry" wrote:
And what is "THIS"?

____________

Rewritten to clarify for "art"

Are you saying that coupling from your 160-m, gaussian, compact, full-wave,
tank circuit, tilted antenna in equilibrium into randomly located conductors
near the transmit antenna is the basis for increased gain from that antenna?

Such random couplings ARE the reason for the increased signals you mentioned
in your earlier statement, "You see this effect in a mobile when the audio
increases as you drive by power lines and the like," and it appears you are
claiming that effect to explain the performance of your 160-m, gaussian,
etc, etc antenna in equilibrium.

Please explain.

RF

No.I do not carry telephone poles on my vehical.What strange thinking