[Towertalk] 1950 era Balun ?

[A9xw@cs.com]

Back in the 60's we used a lot of  B&W coil stock, usually one inside another 
to couple output to an antenna.  Still the usual method or a tapped coil, for 
AM broadcast uisng a tube transmitter.  Solid state goes into a PI or PI-L  
that is tapped.   You tap down the coil to get the best output, one end to RF 
output coupling cap the other to ground, or center grounded on push pull with 
overlaying wrap. Used ferrite rod for QRP stuff.  Can do the same today but 
use ferrite core torroid or similar since coil stock is a little harder to 
get.  On some stuff the output coil was only a turn or two to get the hi-z to 
low z transformation.  

Henry AA9XW 


--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
---