Hi Doug -
Your twin towers sounded a bit familiar. Digging back in my "swamp" I came up
with a two page "Collins "Product Description and Application" from the mid
1960's which describes their Model 237B-4 Rotatable Unidirectional HF Antenna
(Collins part number 522-1536-025).This includes two 80 foot towers, four guy
cables, a 90 foot mast with split bearing at the top and motor, gear reducer
and rotary joint at the base, and a 6.5-30 "Megacycle" LP - 12 full sized
elements (longest is 80 feet) on a 61 foot boom. Antenna is hinged on the mast
and mast hinged at the rotator at the base of the tower. All designed for 120
mph wind or 80 mph with 1/4" on ice.
I was working for General Dynamic / Electronics Division here in Rochester (NY)
at the time and was Project Engineer for the HF communications system antennas
for the Apollo mission tracking ships which required several 7-30 MHz LP's, so
I interviewed and collected data from a number of sources. I also found a spec
sheet from Antenna Products Corp, much less detail of interest except that they
also offered both 6.5-30 LP and a 4-30 MHz LP with a 116 foot boom and longest
element of 123 feet, also with twin 80 foot towers. We purchased the antennas
from a relatively small company down near Boston (CHU Associates) who did a
really nice job of design and manufacture of those and some for another
requirement. I did also talk with and get a quote from Hy-gain but didn't see
any info on their twin tower setup.
Sorry I don't have any specific tower installation instructions, but with the
model and part number you might be able to dig something up. It sure looks like
you should have a real good tower if you can figure out how to safely erect it.
Collins did offer a winch type erection kit for the mast and antenna but that
was only for after the tower was in place.
Good luck with the project !
73's, Gene / W2LU
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