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[TowerTalk] Driv Elem Tuning

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Subject: [TowerTalk] Driv Elem Tuning
From: k5pn@hotmail.com (Ron Chambers)
Date: Tue, 01 Sep 1998 11:23:25 PDT
The practical side of assembling, building, erecting and tuning beams 
that are mounted on non-crank-up/down towers presents a problem. You get 
the thing all assembled per the design/manual, take it all the way to 
60, 70, 80, or even 180ft with the help of several local OM's, put it on 
the analyzer and voila', the "tuning" is off a little. You could beg all 
your help to stay, go thru the procedure of getting it back down the 
tower and adjusting, then back up, etc....maybe just to do it  all over 
again....ad infinitum (maybe I could be a lawyer)......

So my question is, what are the REASONABLE limits, say, if you have a 3 
element beam (monobander? tribander?), of adjusting only the driven 
element length (which you can usually get to on top of the tower)and not 
diminish the ability of the antenna to achieve what it's supposed to? 
...The point being that you are not going to touch the length of the 
reflector or director....(Yes, this was questioned after K5MR repaired 
his full-size 3 element 40M at 170ft and it was 'off' a little, we did 
NOT want to take that thing down...)

Comments appreciated......73...Ron



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