I suspect the super station guys have already seen these and or considered it
but here tis.
I am no longer an IEEE member and do not have the IEEE papers. Brueckmann was
also
the father of the big fat fiberglas center fed vertical you saw on all the
military VHF 30-76 mhz
stuff for years (maybe even yet today - they look much the same) We reduced
that to practice
at AVCO , Evendale ,O. I knew I was getting damn old when I saw one of the
earliest versions
we did mounted on a Jeep in a Military Museum in about 1985 ! .
Here is a link to a paper on an HF array scanning in elevation.
tf.nist.gov/general/pdf/1605.pdf
I have always kind of wondered if a version of this sort of thing would not be
better than stacked yagis
since signal strength variations versus vertical angle of arraival seems to
often be much greater than
the yagi gains .
And another array called ISCAN which I did the individual elements to their
specs but had nothing
to do with design and execution of the full array while at AVCO in late 50s and
early 1960s.
My recollection was it generated 24 vertical elevation patterns - and the array
was a sparse matrix of
center fed verticals about a mile long in a salt marsh up east Md as I recall -
and they had a hell of
a time with wild hogs tearing up the 75 ohm foamflex feeders .
I did get to watch videos of it in action once and it was amazing to watch
signals from Germany on
freqs close to 20 meters and see optimum angle of arrival change in 200
milliseconds in mid day .
Hank K7HP
HF propagation test of ISCAN
H. Brueckmann ; R. Silberstein
IEEE Transactions on Antennas and Propagation
Year: 1963 , Volume: 11 , Issue: 4
Page s : 454 - 458 , DOI: 10.1109/TAP.1963.1138068
IEEE Journals & Magazines
• Abstract
• (464 Kb)
•
ISCAN - Inertialess steerable communication antenna
H. Brueckmann ; J. Gruber ; C. Bramble 1958 IRE International Convention Record
Year: 1962 , Volume: 10
Page s : 152 - 163 , DOI: 10.1109/IRECON.1962.1147021
Cited by: Papers (4) IEEE Conference Publications
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|