[TowerTalk] balun beads for 9913

[Jim Thomson]

For 50 MHz, you want two or three turns through a 1-inch long core and 
two turns through a 2-inch core,. and for maximum noise suppression, you 
will want at least three of these multi-turn chokes in series along the 
line, close to the feedpoint. The reason you need multiple chokes in 
series is that you only need 2-3 turns to put the resonance at 50 MHz, 
so you haven't got much benefit from N-squared.  Fair-Rite  #43 and #31 
are roughly equivalent at 50 MHz.

73, Jim K9YC

##  what do u mean by a 1" long core ?    Does this mean  2.4" OD x 1/2"  thick 
torroids used... and 2 of em stacked ?   Is a 2 " core  consist of 4 x torroids ? 

## It can't be ID.   You won't fit  9913 through a  1"  ID very easily..well maybe u can?
How  far apart is each of the 3 x chokes  to be spaced  from each other ?   How do u
propose to keep this mess away from the boom..and or mast ??   I think I would want
all of them to be at least one outer loop diam away from metal.     If they are touching
metal, the C  between coax braid and boom/mast/tower  will surely screw up the chokes ? 
You would end up lowering their resonant freq.   The stray C would parallel resonate the
chokes..and probably increase the choking Z...  but at a lower freq.   It might be broad enough
peak to still cover 6m.  

## In some cases, you can't hang em below a boom...if the connections  are on top of the boom. 
Even if hung below a boom,  I would not want them flapping in the breeze.   What's the fix ?  

Jim   VE7RF