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In a message dated 98-08-02 11:15:41 EDT, owner-towertalk@contesting.com
writes:
> From: "Gary E. Jones, Ph.D." <gejones@whale.otr.usm.edu>
> Subject: Reverse Tramming
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>
> I don't think that I made myself clear the first time, so I will try
again...
>
>
> What I was wondering is how one attached lines used to keep the yagi
> balanced horizontally (we call those tag lines) as it is coming down the
> tram line. We use 1/4" EHS guy line cable for the tram line on a big
> antenna and it attaches at the top of the tower to a chain wrapped around
> the tower at the top. The boom of the antenna is attached to a pulley wheel
> and hangs under the tram line. The antenna is held by a nylon line running
> up from the base and through the gin pole to the antenna.
>
> The part that I am wondering about are the lines that you use to keep the
> antenna level as it comes down. Unless the antenna is hung perfectly, one
> side of the boom or the other will be slightly heavier and we always use
> small lines attached to the boom ends (or looped over the last element and
> down to the ground) run by two men who tension the lines so the antenna
> comes down the tram level (horizontal) to the ground.
>
> That is an easy task on the way up because the tag lines can be looped
> easily and tied to the boom to mast bracket. When the antenna is installed
> and bolted down, we simply untie the lines, and let them fall to the ground
> (or pull them up.... safer since they tend not to foul on the zippy trip
> back to earth). The problem is how to get those control lines on when the
> antenna is up and needs to come down. With a 48' or 60' boom, the boom ends
> are 30' feet out and it is a random shot to try to get something to hook
> appropriately at the end so that it does not come loose when the antenna
> starts down the tram line.... I like the idea of a plow or torque bar to
> keep the antenna coming down the tram line with barrel rolling... good
idea.
>
>
> So, does that make it clearer??
>
> Gary
> W5FI
>
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Date: Sun, 2 Aug 1998 11:15:37 -0400 (EDT)
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To: owner-towertalk@contesting.com
Subject: BOUNCE towertalk@contesting.com: Non-member submission from ["Gary
E. Jones, Ph.D." <gejones@whale.otr.usm.edu>]
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