2:1 Baluns/Ununs FT140-77, ID=.9", RFI Range .1-10 MHz, Pack of 10Store/Ferrite Core Products/Mix 77/Ring - Mix 77 RFI Range: 100 Khz-10 MHzSKU F140-77-10$34.95On SaleList price $38.95 Save 10%Quantity: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 itFT140-77, ID=.9", RFI Range .1-10 MHz, Pack of 10Store/Ferrite Core Products/Mix 77/Ring - Mix 77 RFI Range: 100 Khz-10 MHzProduct DetailsMPN: F140-77RFI Range (MHz): 100 KHz-10 MhzID-B (in/mm): .9/23OD-A (in/mm): 1.4/35.6Height-C (in/mm): .5/12.7Weight (oz/gm): 33 gramsInitial permeability: 2000A(L): 2250Ferrite Ring Toroid Core, ID = .9"/23mm, Mix 77. Excellent for low frequency switching power supplies. RFI range .1-50 MHz. Bulk pack of 10.Show 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).