"Telamon" wrote in message
...
In article ,
"Michael" wrote:

"Telamon" wrote in message
...
In article ,
"POP_Server=pop.clara.net" wrote:

My personal preference is to use an Icom R75 linked into a Wellbrook
Indoor Loop Antenna.

Having previously used long wires etc, the enjoyment of shortwave
was
masked by interference either mains borne, television timebase or
atmospheric.

A few month's ago I purchased a Loop Antenna for the R75 and quite
honestly it has been the best antenna which has been used due to
space restriction's.

The R75 comes to life from lf, mf, hf and the 30 MHz + section can
be
quite interesting at times.

Interference is drastically reduced by using the loop and my loop is
connected via a short patch lead to the interface and R75 on the
same
table.

The DSP unit is a must and on the amateur bands, especially at
nightfall the loop exceeds all expectation.

Wellbrook have certainly produced a loop which leaves the
competition
behind and I must say that my R75 would never, ever be connected to
a
longwire again.

Will provide a digital image of my basic setup if anyone is
interested.

People that are limited in space to erect a full size wire antenna or
reside in noisy urban neighborhood can greatly benefit from small loop
antennas that have better rejection of local noise sources. The
problem
with them is they require amplification so people not into electronics
or have soldering abilities can't build them.


I keep thinking that an indoor loop would also be nice to have to
supplement my outdoor wire antennas that are both non directional. My
outdoor antennas are good for the most part, but a directional loop
would
really come in handy. I bet I'd be able to copy some weak signals as I
can
with my outdoor wire antennas, but I'd be able to copy them with far
less
noise and potential intermod if I could switch to a directional loop and
isolate the direction once I've found the DX with my outdoor wires. The
Wellbrook loop was one of the antennas that I had in mind, but I'd like
it
even better if I could build one myself for less money.

Because you are working with signals that refract through the ionosphere
the loop will not work very as a directional antenna. The energy is at
least somewhat scattered and the sharp null in the antenna can not be
used to great effect though it will still work to some extent. The main
advantages are size and local noise rejection.

You are always better off with more than one type of antenna because
those differing characteristics will cause one to pick up a signal
better than the other. You then use the antenna that works best at the
time.


The null on the loop wont be of service as a rule, but it will probably show
itself as an advantage at times. I also agree 100 % that multiple antennas
are good to have. I am currently using two outdoor antennas. A G5RV and a
demented random wire that I call "Frankenstein". My G5RV works very well
for 3000 to 9000. My "Frankenstein" roof wire works better then the G5RV
above 9000 and it works especially good from 11000 to 22000. Strange
though, "Frankenstein" also starts working better then the G5RV when you get
below 2000. Go figure.

Id love to have the Wellbrook indoor loop to test against both my outdoor
antennas. If it turns out as not showing itself as an advantage, I can
always sell it off in e-bay :-)

--
Respectfully,

Michael

Location: New Jersey
Primary Receiver: R-75 with full Kiwa mods
Antennas: G5RV, 200ft "Frankenstein" roof wire
Additional Radios: KA-1101,KA-1102,PL-550,
KA-989, Info-Mate 837, GE-SR III
Westinghouse H-104 (seven tube)
Web Site: http://md_dxing.tripod.com