[TenTec] New Jupiter on its Way _ A Few Questions

ny6p01 at gmail.com ny6p01 at gmail.com
Sat Apr 26 16:24:09 EDT 2014


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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