[TowerTalk] Limit Switches, LM 470

[NPAlex at aol.com]

Larry,
Having added switches to 3 different LM-470's I found that there are  
several locations and ways to do it.  The DWN relay is the most straight  
forward, as it can be mounted almost anywhere below the bottom moving  section.  
The upper limit takes more care and some experimentation.  I  have used the 
short 3/8" that is welded to the bottom moving section that acts  as a STOP at 
the upper end.  The micro switch was mounted with a wrap  around bracket on 
the stationary section, and the trip lever was a piece of  stainless 
wire/rod bent to engage the stop mentioned earlier.  I have also  triggered off of 
one of the cross members with a similar arrangement.  The  tower "slop" or 
wiggle requires some experimentation as the wind can cause it to  lean 
differently from time to time.    The best method is what US  Tower does, and 
that is sense both up and down positions with microswitches at  essentially 
ground level.  TriEx does not have a level wind mechanism which  makes the UP 
micro a little more challenging.   I have made a support  bracket above the 
winch drum and took advantage that the cable uniformly  progresses across the 
drum and there is a point that is equivalent to the tower  being fully 
extended.  At least all tweaks and adjustments can be done  standing on the 
ground.
 
Norm W4QN
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Message: 1
Date: Sun, 25 Oct 2009 21:14:21 -0600
From: "Larry  Essary" <larry at essary.com>
Subject: [TowerTalk] Tri-Ex LM-470  (motorized)
To: <towertalk at contesting.com>
Message-ID:  <00ed01ca55ea$69df71c0$4101a8c0 at larry>
Content-Type:  text/plain;    charset="Windows-1252"

Does anyone have  instructions and/or photos that DISPLAY the proper 
mounting of the limit  switches to the tower ?


Larry  K5XG

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