On May 2, 12:07*pm, "Dave" wrote:
"Art Unwin" wrote in message

...

Hold on. I don.t know if I have a pencil beam as I can't measure it or
model it.
However, I don't see that as a real hurdle! The idea that the beam
width changes with frequency is beyond my ken. *As for a final tweaked
design, for a ham that is an impossibility

but you do have one that is built to your spec right? *and you can turn it
by hand? *so if you point it at a local AM station can you see a big
increase in signal strength and a good front-back and front-side ratio?? *I
don't need a 'final'design, as you say that is impossible for a ham, but
i'll settle for something better than a 4-square for 160m that i can turn
with a normal rotor!

Yes you are correct. But I am waiting for some remote relays for the
rotator scan and asmith control and some other things with respect to
the antenna. Ordered from China
so it will take a bit more than a week from now, then I can do as you
say. For beam width changes I also need a adjustment contraption to
change up or down from what I have now but that is a summer job ie
bells and whistles. I have Jim's sample antenna packed and ready to go
and he is probably more experienced in that area, when I receive his
address via e mail, it is packed in a priority mail container. He can
pass on what it does but without comment with respect to construction.
Construction details are private and I am not going to disclose those
until there is a climate change.
At the moment Jim is the only guy I can trust on the newsgroup and the
only guy I have great confidence in so if he provides a finding I can
believe it as it will be specific and to the point As far as the four
square goes without change in azmith I don't believe it can compete
but we will see.
Having a get away week end at the moment with the wife antennas have
been put to one side.
Art