Regarding heavy duty rotors ...
Coal was still a primary heating fuel in Idaho during the late 60's. My
first antenna rotator used a coal stoker transmission that a local
farmer gave me. That sucker was about 1 cubic ft, weighed 75 lbs and
would turn a house, not to mention my TH6DXX. I wonder how many are
still around? The transmission was bolted to the top of an 80 ft wooden
pole using 1.5" angle iron and huge thru-bolts. A tiny sewing machine
motor was used to drive the transmission at about 0.5 rpm.
Incidently, direction indication was implemented with a couple of
Selsyns. I couldn't afford real pulleys to drive the rotator selsyn, so
I improvised by bolting two Mason jar lids back-to-back. The Selsyn
drive belt was fabricated from the elastic waistband of my older BVDs.
I had to replace the elastic about once a month; newer BVDs had better
elastic which lasted longer. The constantly disappearing underwear
drove my Mom nuts :-)
73, Kevin N6ER (ex NC6U, WA7MPS)
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Administrative requests: towertalk-REQUEST@contesting.com