Balun Transformer Links 

• The Elecraft Mini-Module BL1 Balun (1:1 and 1:4)

• The Balun Transformer

• 1:4 Balun Picture and Data - W4ED

• Homebrew A 1 To 4 Balun

• Putting a Balun and a Tuner Together W9CF

• Winding Toroids - It isn't really that tough!  WT9W

• EXPERIMENTER KITS, CHOKES & ANTENNA BALUN KITS

• MANUFACTURERS OF FERRITE AND POWDERED IRON CORES