Darrell,
Read with interest your comments below. I am not a very technical
person, and have only played with the W7EL(?)s EZNEC recently. With
what I know and have played with it is a good program, but I am still
learning it.
What really caught my eye was your comment about the parasitic vs. 2
element driven delta loop. I used a 40 meter version from here, 2 full
wave delta loops, spaced 17 feet apart, with the loops fed 180 degrees
out of phase (ZL Special). I pointed it about 45 degrees to favor the
US and had a ball on 40. The friend that helped in the design of it
was recently killed in a small plane accident, so I can't ask him. As
I recall, he felt that the out of phase feeding was a better system
than a driven element with a parasitic reflector. Pete was an RF
Engineer, worked with the US Navy and then worked for
Motorola/Australia. He could talk in circles over my head, but
normally brought it down to my level.
I used the 40 meter array for about a year, then had to move houses on
our mission compound. It was large and unwieldy, but could be rotated
in a sense (several hours to pull up the anchor ropes, move
everything, rearrange the loops and then re-stake it to the ground.)
We are now back from furlough in the USA and have a tower coming, to
plant in our own yard. I am planning on building my farm around the
tower, but haven't come to any conclusions about what I want for
antennas for the lower bands yet.
Well, I've waffled on long enough. Hope this is of some interest to
you.
73,
Norm Beasley, P29NB/KO4CB
Ukarumpa, PAPUA NEW GUINEA
Internet: norm_beasley@sil.org
______________________________ Reply Separator _________________________________
Subject: Antenna modeling software
Author: Darrell_Upson@pa.xerox.com at internet
To: <towertalk@contesting.com>
Date: 16-01-97 8:29 AM
Since I didn't receive any responses to my query on gain differences
between parasitic vs. driven 2 element delta loop arrays, maybe
someone can recommend some good software that I can purchase to do
this on my own. Any recommendations?
Thanks,
Darrell WB6ADZ
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