2:1 Baluns/Ununs +3 +2FSB31-1/2, ID=1/2", RFI Range 1-300 MHz - Bulk 10 PackStore/Ferrite Core Products/Mix 31/Snap On - Mix 31 - RFI Range 1-300 MHzSKU FSB31-1/2-10$49.95On Sale$55.00 Save 9%10 $4.95Quantity:1 Add More Add to CartGo to CheckoutSave this product for later Favorite Favorited View FavoritesShare this product with your friendsShareSharePin itFSB31-1/2, ID=1/2", RFI Range 1-300 MHz - Bulk 10 PackStore/Ferrite Core Products/Mix 31/Snap On - Mix 31 - RFI Range 1-300 MHzProduct DetailsMPN: FSB31-1/2-10Initial Permeability (@ 10KHz): 1500Material: MnZnMax cable size - in/mm: .5/12.7OD (A) - in/mm: 1.22/31ID (B) - in/mm: .514/13.1Length (C) - in/mm: 1.55/5Z (ohms per bead - single turn 1 MHz): 25Z (ohms per bead - single turn 5 MHz): 71Z (ohms per bead - single turn 10 MHz): 100Z (ohms per bead - single turn 25 MHz): 156Z (ohms per bead - single turn 100 MHz): 260Z ohms (per bead - single turn 250 MHz): 260RFI range from 1-300 MHz Ferrite Snap On, ID = .514in/13.1 mm, Mix 31 # Turns of RG-8X = 2 # Turns of RG-213 = 1Square or Hex sided depending upon inventory stockShow More2:1 (100:50) Baluns are useful between 50 ohm coax and 100 ohm balanced lines for loops, cubical quads, log periodics and other antennas where the impedance at the end of the feedline is 100 ohms (1/2 wavelength feedline).