2:1 Baluns/Ununs +2FSB31-3/8, ID=3/8", RFI Range 1-300 MHz, Bulk Pack of 50Store/Ferrite Core Products/Mix 31/Snap On - Mix 31 - RFI Range 1-300 MHzSKU FSB31-3/8-50$149.95On SaleList price $187.50 Save 20%48 $2.70Quantity:1 Add More Add to CartGo to CheckoutSave this product for later Favorite Favorited View FavoritesCustomer reviewsNo reviews yet. Only signed-in customers who bought this product can leave reviews. To leave a review, sign inShare this product with your friendsShareSharePin itFSB31-3/8, ID=3/8", RFI Range 1-300 MHz, Bulk Pack of 50Store/Ferrite Core Products/Mix 31/Snap On - Mix 31 - RFI Range 1-300 MHzProduct DetailsMPN: FSB31-3/8-48Initial Permeability (@ 10KHz): 1500Material: MnZnMax cable size - in/mm: .388/9.85OD (A) - in/mm: .933/23ID (B) - in/mm: .4/10.15Length (C) - in/mm: 1.55/39.4Z (ohms per bead - single turn 1 MHz): 18Z (ohms per bead - single turn 5 MHz): 50Z (ohms per bead - single turn 10 MHz): 81Z (ohms per bead - single turn 25 MHz): 144Z (ohms per bead - single turn 100 MHz): 240Z ohms (per bead - single turn 250 MHz): 270Ferrite Snap On, ID = .40 in/10.15mm, Mix 31 - 50 piecesShow 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).