March 2006 - Building a 1:1 balun by Réal VE2DSK

 
 

Manual (french only) from Réal VE2DSK and Martin VE2MJT on baluns in PDF format (110k)
 
Note: Print front and back of this manual on three (3) 8 ½" X 11" sheets and you will have a compact 12 page manual.
 
Information is taken from the following pages:
 
http://www.catchnet.com.au/~rjandusimports/balun_winding.html
 
http://www.amidoncorp.com/aai_ferriterods.htm
 
This balun works well on 80 to 20 meters.
 

 

Balun's electrical schematic
 

 

The 10 turn winding of the #16 enameled wire on an R-61-037-300 ferrite. The blue fishing line merely acts as a spacer between the turns
 

 

A dremel is used to remove the varnish on the wire's extremities.
 

Cleaning is now finished, the wire's extremities must now be tinned.
 
 

A ¾" PVC Tee, two capped small lengths of pipe, PVC glue and two 8" wires on each side.
 
 

One last cap and the balun is completed.
 
   
Michel VE2MAA improvised a template to cut the pipes   Shrink tubing wraps the central ferrite core   Excessive tubing is removed
         
   
The next step is to allow for assembly of upper part of the balun   Here, Denis VE2DTZ cutting lengths of #16 enameled wire   Cleaning all CPVC parts is very important before glueing
         
   
Bulk cap drilling (25 baluns so  75 caps)   Next step in pipe cutting   Réal VE2DSK found a trick to strip enameled wire using a simple rotary tool
         
   
Here we cut the 3rd non conductive nylon wire   Here, Yvon VE2CVB winds the #16, 2 conductor wire with the 3rd insulated wire on the ferrite core   Other teams set up the #12 wire ends to be part of the antenna
         
   
Once a knot is made in the cap, hot glue will seal the assembly   Detailed view of previous step   Stripping of the wires that will connect to the antenna
         
   
Installing the coiled ferrite balun   The balun input is a simple RG58 type coax with a UHF connector   Installing the connector