In a message dated 7/9/2009 6:35:46 A.M. Pacific Daylight Time,
towertalk-request@contesting.com writes:
> I'm getting ready to tram up a M2 6M-7JHV to 77 feet on a guyed Rohn
45
tower. I have never trammed one up but have seen many pictures of it being
done. Have a few questions,I know this is a smaller lighter antenna which
is
why I want to try with this one first before I do my M2 75/80 meter
rotatable dipole late this year or early next year.
1. How far apart should the 2 support lines be?
First, you're not tramming up anything. A tram is a single cable with
the load slung under the tramline via a pulley. What you're describing is a
TROLLEY system where the load rides on top of 2 lines ala' a trolley car.
It is a far inferior technique than the tram. The 2 lines are
difficult (impossible?) to equalize, you have to have some kludge up on the
tower
to secure the lines to, the antenna is probably out of balance and you've
got lots of friction as the antenna rides up the line. You have NONE of those
problems with a tramline.
Let me know if you're interested and I'll send you the chapter from my
upcoming tower book that includes tramming. Anyone else that's also
interested, let me know and I'll send it to you as well.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for hams
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