In a message dated 97-07-03 00:23:12 EDT, k6ll@JUNO.COM (David O Hachadorian)
writes:
> On Tue, 1 Jul 1997 13:53:32 -0700 (PDT) Pat Barthelow <aa6eg@tmx.com>
> writes:
>
> >will the Ham-4 handle any of the followinng antennas:
> >
> >1. Cush craft 20 Meter Monobander, CD 20-4
> >2. Hy Gain KT-34XA, 32 ft. boom
> >3. Cushcraft 2el 40 meter
> >4. KLM - Custom, 5 el 20, 56 ft Boom
> >5. KLM 5 element, 15 meter beam, 35 ft boom.
>
What you need to do if determine the Effective Moment (EM) of each
antenna and match it up against the EM figure in the Hy-Gain catalog.
Effective Moment is the turning radius times the weight. For example, the
20-4CD is 23.75 X 55 = 1306 ft.lbs. of EM; the rating of the Ham IV is 2800
ft.lbs.
BTW, the MARC (Mast, Antenna and Rotator Calculator) Program calculates
the EM and recommends an appropriate rotator.
73, Steve K7LXC
TOWER TECH -- professional tower supplies for amateurs
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