[BC] Long Wire

Phil Alexander dynotherm at earthlink.net
Sat Feb 20 01:25:14 CST 2010


>From: Scott Bailey <wmroradio at bellsouth.net>
>
>Somebody told me that they would do the math on it, the
>tower's height, impedance, etc and move the wire up or 
>down until that go it at the right point.

     That is more or less true except there are variations
     so you may have to move the feed point out from the
     tower to keep the slant wire ~45 degrees inclination. 

>An engineer from MTSU told me my ATU would be twenty feet 
>from my tower, then start the point of moving the wire up 
>and down until the right match was found. 

     More or less except as noted above.

>The tower climber would have to come on and off the tower 
>each time it was move. 

     Usually they can go up the tower and sit in their belt
     although you may have to cut back to 100 watts or so
     to keep his personal RF alarm happy.

>I have no clue how he would have model it, but he does have
>the software to do it.

     For anybody who has done much modeling it is a snap.

>We didn't do it because it wasn't legal. If I had my way 
>about it, I would have as the engineer from MTSU to do it.

     Jacking the tower up and putting (an) insulator(s) 
     under it might be simpler, especially since there 
     is no FM on the tower, and might be that expensive
     since the tower is fairly small.

Phil Alexander, CSRE, AMD



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