Wellbrook ALA 100 with Rotator - Construction Details

[Guy Atkins]

Those with an interest in building a Wellbrook ALA 100 setup for use on an
antenna rotator may want to check out my most recent blog entry (July 22nd).
I have pictures and construction details that describe the way I approached
the project.

I believe the ALA 100 is the most flexible and useful Wellbrook model for
the do-it-yourselfer. You can construct the loop in whatever manner suits
your abilities and requirements.

My use of the ALA 100 is primarily for DXing foreign medium wave signals,
with a secondary use of hearing third-world broadcasters on the tropical
bands. I've heard of some amateur radio operators using Wellbrook antennas
for a receive-only solution, too.

73,

Guy Atkins
Puyallup, WA USA
blog: www.sdr-1000.blogspot.com

[miso@sushi.com]

Guy Atkins wrote:
> Those with an interest in building a Wellbrook ALA 100 setup for use on an
> antenna rotator may want to check out my most recent blog entry (July 22nd).
> I have pictures and construction details that describe the way I approached
> the project.
>
> I believe the ALA 100 is the most flexible and useful Wellbrook model for
> the do-it-yourselfer. You can construct the loop in whatever manner suits
> your abilities and requirements.
>
> My use of the ALA 100 is primarily for DXing foreign medium wave signals,
> with a secondary use of hearing third-world broadcasters on the tropical
> bands. I've heard of some amateur radio operators using Wellbrook antennas
> for a receive-only solution, too.
>
> 73,
>
> Guy Atkins
> Puyallup, WA USA
> blog: www.sdr-1000.blogspot.com

Ah, so your loops are concentric. I ran my parallel. Did you discuss
this with Andy?

[Guy Atkins]

I did mention the spiral configuration to him, but he didn't comment on it.
The construction seemed to be easier, so it's the only style I considered
from the start.

Guy

> wrote in message
ups.com...
>
> Ah, so your loops are concentric. I ran my parallel. Did you discuss
> this with Andy?
>

[RHF]

GA,

Nice design and execution of the Wellbrook ALA 100 Loop Antenna
as a portable and point-able (rotate) Antenna.

A Close-Up Look : The Wellbrook ALA 100 Antenna with Rotor
http://www.sdr-1000.blogspot.com/
The most flexible Wellbrook Antenna for the Radio Antenna Experimenter.

~ RHF

[Telamon]

In article >,
"Guy Atkins" > wrote:

> I did mention the spiral configuration to him, but he didn't comment on it.
> The construction seemed to be easier, so it's the only style I considered
> from the start.
>
> Guy
>
> > wrote in message
> ups.com...
> >
> > Ah, so your loops are concentric. I ran my parallel. Did you discuss
> > this with Andy?
> >

Spiral concentric or coil will change the pattern but since the antenna
is so electrically small it won't make much difference unless you want
to use the nulls. I would expect that a coil wound would be best. I you
are concerned about using a null in the antenna pattern then go one turn.

--
Telamon
Ventura, California