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Hello Henry,
Funny you should ask. I just got done some experimenting with the
Isotron
antennas for 40 and 75 mtr. No, they are not Isopoles or Isoloops. They
are very
strange looking. Look it up in QST or CQ. The guy who designed, makes
and sells
these things is Fred Bilal. I believe that's his first name. Send for
his
literature. I think you'll find it interesting.
The ones I have for 40 and 75 I picked up at a swap meet and decided to
give
them a try. The 40 meter version is approx. 28in.H X 15W X 12D. the 75
meter
version is approx 40H X 15X X 8D. Weight is approx 4 lb. for the 40 and
6 lb.
for the 75. One recommendation from Mr. Bilal is to mount the 75 and 40
meter
versions back to back on the same mast, which only requires 1 coaxial
feedline,
which I did. They were up about 30 ft. Also tried them at 13 ft with
similar
results to 30 ft. Appears the more height the better (imagine that)
.They appear
to be omni directional for the most part. They are also somewhat
sensitive to
surrounding objects, particularly large metal surfaces, more so than a
wire
antenna for example.
Here's an example of how they worked. I live in the L.A. area and speak
to a
friend of mine in the Phoenix area almost nightly on 75 meters. I
normally use a
dipole with apex at 42 ft. and the ends at 20 ft. On 75 meters, the
signal on
the Isotron was typically 2-3 S units below that of the wire. Sometimes
dead
even depending on conditions. I got about the same results on 40 meters,
2-3
units down. Not bad for an antenna so amazingly small, especially on 75.
I also
pumped 1K through these things with no problem.
The Bilal Co. makes Isotron's for each of the other bands also,
including 160
meters. There's even a sketch in the literature that shows three of
these
things, 10, 15, and 20, all mounted on the same mast. The Isotrons above
30
Meters are considerably lower in profile than the lower freq. versions.
Also
height is recommended for better performance.
I'll throw this out to the reflector. Someone may find it interesting.
Good luck
to your friend. I am also not connected in any way with the Bilal Co.,
but did
find his product interesting.
73,
Jay, KM6VX
Torrance, Ca.
I have a friend moving to an apartment. He wants to stay active, but
will
probably be very limited in his antenna choices. The first thing to come
to
mind is the AEA loop antenna. Does anyone out there have any experience
with this antenna? Any other antenna ideas? He should have access to a
balcony, so wire isn't out of the question, but we can't plan on it.
Please respond directly to save band width.
Thanks, Henry
Henry Gillow-Wiles
henry@rio.com
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