[TowerTalk] 160m inverted L now up

Jerry Connelly jerryc at clinchrivercorp.com
Sun Dec 7 15:51:31 EST 2003


Hello to all.
Better weather and a few hours of daylight  before leaving for work this
morning and I have a new 160m inverted L in the air but untried.
It didn't go as planned and I need some advice, reassurance or criticism
to know what to do next.  

I had planned to put up about 175' of wire.  The 40' tower and standoff
would get the vertical portion up 38' above ground and the rest would run horizontal
to an unused wooden light pole with a wooden cross bar at the top to toss a line
over.  The line went over the cross bar easily but brought disaster.  The cross bar had
rotted with age and the connecting bolts failed and down came the entire cross bar and
no easy way to get a pulley up.  

The only support nearby was a tree about 65' from the tower.  65' + 38' = too short.
I remembered reading in the ARRL antenna book about linear loading (folding the wire
back on itself) and it is supposed to have less loss than inductive loading or traps.
I ran 12ga insulated wire for the vertical segment (40' long) to the insulator on top then I ran
58' of 450 ohm ladderline (one wire connected to the 12ga vert. wire, the other end left floating)
from the insulator at the tower cross bar to the insulator at the tree (ladderline ends shorted
together at this end).  This gives me approx. 156' of wire. Its longer than a 1/4 wave but short
than the 165 to 175' that I wanted. 

The loading is in the horiz. section and most loss in inverted Ls is in the ground loss around
the vert. and in ground loss under a long low horizontal section.  The linear loaded design I used
leaves the vertical section as it would usually be and the horiz. loading might reduce ground loss 
since its shorter.  Is this right or would the horizontal section ground loss still be the same (folded 
wire loading means same length of wire at the same height)???

I had just enough time to lay down 3 ground radials (132' long) and 2 short (25' long) before 
leaving out to work. The tuner seems to like it but tonight will tell the tale.
Any thoughts on this???
Thanks
JerryC
KC8TES


 




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