K8JHR wrote:
I have used the Wellbrook ALA-100M receiving loop for over a decade
with good results at two locations. It is a "medium or large
aperture" loop, because you supply whatever size wire loop you want.
I used mine outside, but you could do it inside, but of course it
tends to be more RF quiet the farther you get away from your
dwelling. Wellbrook also makes a model that uses a 1 meter alum loop,
which works well indoors. The loop does not have to be round or
symmetrical, and you can use very light litz wire which is nearly
invisible outside. They can also be used indoors, as in an attic, but
you don't want to be listening on it when you are transmitting on it,
if you cannot locate it at least 1/4 to 1/2 wavelength away from the
transmitter antenna (which applies to all receive only antennas I
suppose.) These work on the magnetic portion of the electromagnetic
waves we work with, as does Rick's project.
See The Wellbrook products here:
http://www.wellbrook.uk.com/antennashop/
I have also used a DX-Engineering active whip with good results. I
have mine in the front yard, away from the transmitting antennas in
the back yard, and it has a very low profile. These work on the
electrical portion of the electromagnetic waves we work with. They
have a single vertical whip model, and a dipole model, and you can see
them here:
single vertical model:
http://www.dxengineering.com/parts/dxe-arav3-1p
dipole model:
http://www.dxengineering.com/parts/dxe-arah3-1p
I have used both the Wellbrook loop and the DX-E active whip with good
results as receive only HF antenna on my small suburban lot, although
they are substantially more expensive than Rick's home brew project.
I know several SWL's who have built similar loops to Rick's project,
with good results. It is a classic.
I went to the Wellbrook site. But the antenna you cited was 60" in
diameter, too large for my room. Did you say they had some smaller
loops? In any case, I'm going to try to build a receive mag loop
according to the instructions Rick provided. It seems like a straight
forward project that should take a few hours at most.
Happy trails.
---------------------- K8JHR -----------------------
On 4/25/2014 6:05 PM, Jim Allen wrote:
You might also consider the helically loaded loops that K8NDS has been
developing.
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