[TowerTalk] Tram question.

[Steve Maki]

Greg Fox <fox@obsolete.org> wrote:

>I'm raising a C31XR to the top of 100' of 25G. It's resting place 
>will be about six inches above the flat top section. I'll be using
>3/16 EHS wire rope for the tram line, and a pully at the top of 
>the tower and down at 30' for the haul line. 
>
>The antenna hangs underneath the tram line, which leaves me in a
>dilema. Would it be possible to tram the C31XR up to 100' than 
>remove the tram line and attempt to lift or hoist the antenna 
>into place a foot or two above where the tram line left it? Or,
>would it be ok to affix the tram to the 2" 6061T6 alluminum tubing? 
>
>My insides tell me not to do the latter, and I'm sure you guys
>probably will too. I've thought about making some sort of steel
>raiser that would clamp to the 25G and give it extra height, but
>that seems falible also. 
>
>I'd really like to tram it right into place so I don't have to 
>man handle 90lbs of spread weight 100' in the air. However, I 
>guess it might be alright if I tie it in such a way so that it
>can't pitch or roll, but rather, just slide straight up. 

Here's what works for me:

Attach your load pulley high enough on the mast for the final pull.

Attach a second pulley at, or just below, the tram line.  The load
line passes through the second pulley, thereby pulling the load from
that point.

When the antenna reaches the tower, remove the tram line, remove
the second pulley from the tower, and pull the antenna up the rest
of the way, without needing any re-rigging or load transfers.

--
Steve K8LX

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