On Fri, Apr 25, 2014 at 06:31:33PM -0400, 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.
Do these loops require a low noise preamp? I don't think the Jupiter has
it's own built in preamp.
>
> 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.
>
>
> 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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