Well... the Wellbrook and DX-E antennas I mention do. Not sure about
Rick's loop. But even of that type, a preamp locate at the base of the
loop is done. There are loads of articles on these receiver loops on
the internet, as SW listeners are fond of them - broadband and quiet.
Although, as Rick says, some guys mix up the feed point arrangement, and
so you want to be careful about how you do yours.
I doubt the rig preamp would be useful here, except to FURTHER boost the
signal (and any noise - darn it.) As rick mentioned the magnetic field
is the key to this type of antenna, and a preamp is often used just to
get a useful signal to the rig (low tech explanation, sorry) so i doubt
you can substitute the Jupiter preamp in lieu of the loop preamp.
Further, I suspect the preamp is constructed such as to present a 50 ohm
load to the receiver input - you would have to accommodate that if you
dispensed with the loop preamp in lieu of the rig preamp.
Hope this makes sense.
================= JHR ===============================
On 4/26/2014 4:24 PM, ny6p01@gmail.com wrote: loop you want. I used mine
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.
_____________________________________________________
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|