Ok, you got 2 things on me: guts and space. I quit tramming 'cuz I
didn't really feel comfortable with the setup, and didn't have the
clear ground space to lay out the antennas. I did do some smaller
stuff on my R25.
I put up my 3 el 40 (275#, 170') in pieces - Boom first, then tilted
it and put the elements on. Biggest thing I trammed was a 2el Wilson
40 to 150' - to the mast (2"x1/4", unknown alloy, sold by Telrex).
I think one of the biggest keys is what you feel comfortable with.
The rigging to do a proper tram for a big beam can be substantial and
it takes an experienced & disiplined ground crew. I don't want to see
someone get killed tramming up to the top of a mast that's secured
only by a thrust bearing!!
______________________________ Reply Separator _________________________________
Subject: Re: [TowerTalk] Re: Long mast, intermediate bearing
Author: K7LXC <K7LXC@aol.com> at Internet/Unix
Date: 4/3/98 10:44 AM
In a message dated 98-04-03 09:02:52 EST, email@example.com writes:
> I don't think you want to hook your tram line to the mast unless it's
> a real small beam on a short tower. There is a LOT of tension on that
> line. Hook it to a tower leg at the top of the tower. If the tower is
> guyed, remove one guy (loosen the other 2 a bit) and let the tram line
> (I used 3/16 EHS for a tram line) be a temp guy. When you get the ant
> up there, hang it from the tower, relocate the tram, move the pully up
> on the mast and then pull the ant UP. If you do tram on the mast,
> consider a couple back guys on it.
While I sometimes use the 2-step method described above, you can use a
proper mast to anchor the top of the tram line. With back-guying there's
little or no pull on the mast and you can go as big as you want. I've trammed
up full-sized HD 40M beams (250-300#) directly from the mast. It WAS a 4130
mast with 3/8" wall so it was industrial strength and it was back-guyed.
Cheers, Steve K7LXC
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