[TowerTalk] Proposed Changes to 40 Meters

[K7GCO@aol.com]

In a message dated 5/28/01 8:38:41 AM Pacific Daylight Time, w7ti@jps.net 
writes:

<< On Sat, 26 May 2001 22:19:38 -0700, Stan or Patricia Griffiths wrote:
 
 >For most of
 >us, it means more than just telescoping the elements out a
 >little farther.  I doubt there is enough spare aluminum in
 >your current beam to do this. 
 
 _________________________________________________________
 
 To go from 7.0 to 6.9 MHz, just add approximately 5.5 inches to the end of 
each
 element.  It does not have to be aluminum tubing, just a piece of stiff wire
 would do fine.
 
 73, Bill W7TI
  >>
Bill you are right.  But the wire will have to be a fair amount longer than 
the equivalent tubing length it connects to due to it's small diameter.  I'd 
make a big loop as if you don't, it could spit fire.  A commerical BC AM SW 
station found that out with small diameter tubing at the end of a vertical.  
A ground keeper came in and told them "there was on fire coming off the end 
of the vertical."  They came up with a special loop for the tips that cured 
the problem and it works.  I had an antenna with voltage so high it cracked 
insulators at 250W.  This special loop cooled it completely.  If the yagi at 
the SW BC Station in SA had this loop on the elemetn tips at the high 
altitude there, Moore's quad wouldn't have seen the light of day.   

The Station Mgr of the SW station told me "they have a way to test antenna 
tips for break down.  If they can play Stars & Stripes Forever with no fire 
on the end of the antenna tips, it will take anything else of the day."  k7gco

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