Appreciate all of Guy's K2AV sage comments, as they are correct. The Force
12 140N element design is a product of more than 8 years elapsed time, 4
years of specific design time and 18 months of build it and validate time.
I put up the first two 340N's myself and they are still
running just as new. All Force 12 antennas are done following regimented
methodology,
time-consuming building and testing, outside consulting and various test
sites - that is
why it takes so long.
I am impressed that Mr. Rauch has acquired an overhead of the C-39XRN, as
it has not
been announced formally in our Brochure as a product and those delivered
were to people
who were more of an insider than a customer. It, too, was a long
development project.
The characteristics of the 140N element are well known to me, as I designed
it and have
tested it in many environments and combinations. Placing the 40N driver
between the
20-15-10 reflector zone and drivers modeled pretty well, as this element is
close to
transparent. Nothing is truly transparent in the very near field, as it is
a hunk of
metal, so there were adjustments made to compensate. The result is the
ability to have a
wider boom for the 40 mtr spacing, while only extending the overall boom
3', which
compares to very close spacing on the C-36XR with both 40 mtr elements out
the back of
the antenna. The C-51XRN shares basically the same 240N spacing as on the
'39, except we
were able to not extend the boom - nice, because it is big enough already!
Someone want to know how we do it? Hard work and being honest during the
process.
We have concurrent development projects going on all the time (most
prompted by customer
requests) and release products only when they have been thoroughly tested.
If they do
not meet our standards, they remain in the "files."
One final comment - someone said something to the effect that an open
sleeve element
combination acts like a trapped element - not hardly. If anyone has more
design and
tower time than I do with open sleeves, let them stand up and be counted. I
also have
the patent on the 3-band open sleeve, have built more than 70 different
designs using
open sleeve driver cells and sleeved parasitic elements. The largest is the
C-49XR,
which took close to 2 years after we had been shipping the C-31XR - and you
thought it
was easy - just add another forward cell?!! They are nothing like a trapped
element.
Always accepting suggestions for products and improvements. The SIGMA
verticals are one
more example. They are a new era in verticals - again - took several years
to do it.
73, Tom, N6BT
Force 12, Inc.
--
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
|