[TowerTalk] Reverse Tramming

Sun, 2 Aug 1998 18:02:14 EDT

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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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Subject: BOUNCE towertalk@contesting.com:    Non-member submission from ["Gary
	E. Jones, Ph.D." <gejones@whale.otr.usm.edu>]   
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