FT140-43, ID=.9", OD=1.4", RFI Range 25-300 MHz
Product Details
RFI Range (MHz): 20-250 Mhz
ID-B (in/mm): .9/23
OD-A (in/mm): 1.4/35.6
Height-C (in/mm): .5/12.7
Weight (oz/gm): 33 grams
Initial permeability: 850
A(L): 1060
Frequency (MHz)/Single turn impedance (ohms): 25MHz:38 ohms, 100 MHz:80 ohms
Ferrite Ring Toroid Core, ID = .9"/23mm, Mix 43
Excellent for impedance transformers like 2:1, 4;1, 9:1 or use our convenient Balun/Unun DIY kits with all the parts needed.
12:1 Ununs are useful between coax and long wires with a load impedance near 600 ohms like a beverage antenna. Shortwave listener antennas also can benefit with the 12:1 unun and it may provide a better match than 9:1 ununs – this means quieter noise levels and stronger signals so you can hear distance stations easier.