Topband: Coil form material

Chortek, Robert L rlc at berliner.com
Wed Nov 2 20:34:42 EST 2005


Topbanders,
 
I have made a loading coil for 160 meters of # 3 solid copper wire,
turns spaces about 1/4" apart, and 7" wide.  It is air wound except the
coil holds its shape with two 12" by 1" by 1/8" pieces of polycarbonate
- one on each side. Each turn passes though a small hole  in the
material (each piece is drilled with say 12 holes and the wire is wound
through the holes - one on each side of the coil.  
 
My question is this: will I get better performance if I use a different
material to hold the coil in shape? I am told the dielectric constant of
the polycarbonate is 4.2; whereas Teflon is 2.0 and Delrin is 3.7  Is
there a meaningful difference in these materials for my purposes at 160
meters?
 
 
As always your help is very much appreciated.
 
73,
 
Bob/AA6VB
 
 


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