Hi Roy

I have tried to locate someone in the commercial level of antenna
development to "show off" what I have uncovered with this hemispheric
coverage antenna concept. I have no interest in making money with this
concept. But, I am proud to have developed it.

It would wrong for me to say that this concept is any better than a Quad
Helix for anything except NOAA satellite imaging. Its main superiority is
its sensitivity to signals at the horizon, and thats no more than 6 dB.
A major benefit associated with this design concept is it's being non
critical to manufacturing tolerances. So, I thought it would be
interesting to guys who build their own APT antennas.

The concept is -- an array of two pairs of 1/2 wave dipoles spaced about
1/4 wave apart and tilted slightly from vertical. One pair is fed in phase
with each other. The other pair is also fed in phase with each other, but
90 degrees later than the other pair.

Jerry

"Roy Lewallen" wrote in message
...
This sounds very much like the requirement faced by GPS receivers, so you
might also try some forums dealing with that technology. To my knowledge,
patch and quadrifilar helix antennas seem to be the most commonly used.

Roy Lewallen, W7EL

Jerry Martes wrote:
I have become interested in trying to develop antennas for hemispheric
coverage for circularly polarized signals. My interest in related to 137
MHz weather satellites, but not restricted to that frequency.
I have one concept for receiving NOAA satellite signals that is
slightly better than with a Quad Helix.

My reason for this post is to try to communicate with anyone with
interest in this antenna development as a hobby. That is - I'd like to
be able to exchange ideas with another amateur antenna hobbyist.

Jerry