hula hoop antennas
 

hi i have read in one of the old ARRL books about a hula hoop antenna that
only stands about 3 inches high on 10 mters but works like a full size
dipole has anyone built one and if so how did it work
many thanks
dave

It worked fine. But you forgot to say the tuning capacitor with its
connecting wires was 15 feet long.

"stripy" wrote in message
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hi i have read in one of the old ARRL books about a hula hoop antenna that
only stands about 3 inches high on 10 mters but works like a full size
dipole has anyone built one and if so how did it work
many thanks
dave

Well, the first part is correct- the DDRR, but as far as working as well as
a full length dipole- that remains in the realm of the marketing folks.

Dale W4OP

hi i have read in one of the old ARRL books about a hula hoop antenna
that
only stands about 3 inches high on 10 mters but works like a full size
dipole has anyone built one and if so how did it work
many thanks
dave

Well, the first part is correct- the DDRR, but as far as working as well
as
a full length dipole- that remains in the realm of the marketing folks.

Not to mention that unless you remotely tune the capacitor it is very narrow
banded.

On Tue, 2 Mar 2004 20:05:36 -0500, "Ralph Mowery"
wrote:


Not to mention that unless you remotely tune the capacitor it is very narrow
banded.


What capacitor? Writeup in 1968 handbook doesn't show one.

--
-fb-

Not to mention that unless you remotely tune the capacitor it is very
narrow
banded.


What capacitor? Writeup in 1968 handbook doesn't show one.


The one that is needed to tune the antenna if you want to operate it over
much more than a few Kc on 80 or 40 meters without cutting or finding a way
to make the antenna longer.

hi i have read in one of the old ARRL books about a hula hoop antenna that
only stands about 3 inches high on 10 mters but works like a full size
dipole has anyone built one and if so how did it work
many thanks
dave


Dave,

I read about the Hula Loop antenna. I think it's the same thing as the
Magnetic Loop antenna. I have several magnetic loop antennas here and I can
say that they work very nicely.

Check out my homepage for more information.

73, Norbert (PA7NR)
http://www.qsl.net/pa7nr/index.html

On Wed, 3 Mar 2004 00:00:34 -0500, "Ralph Mowery"
wrote:


The one that is needed to tune the antenna if you want to operate it over
much more than a few Kc on 80 or 40 meters without cutting or finding a way
to make the antenna longer.



Understood.

Kc???? Your age is showing ;-)

--
-fb-

dave wrote:
"Hi, I have read in one of the old ARRL books about a hula loop antenna
that only stands about 3 inches high on 10 meters but works like a full
size dipole."

There is a related horizontal Hula-Hoop antenna, Fig. 3.35 on page 43 of
"Short Wave Listener`s Handbook", a CQ "Technical Series" book by John
Schultz, W2EEY. This is probably from a reprint of a "CQ" article.

The antenna looks like a short-circuited 1/4-wave stub, turned up with
its conductors into a vertical plane, then coiled into a nearly complete
loop.

So, the small loop should tend to have nulls perpendicular to the planes
containing the parallel coils made by the stub. Response should be good
in the planes of the wires making the two loops. But, the article
doesn`t say.

Best regards, Richard Harrison, KB5WZI