FT400-3I, ID=3", RFI Range 1-300 MHz, Case of 25

Store/Ferrite Core Products/Mix 31/Ring - Mix 31 - RFI Range: 1-300 MHz

Product Details

RFI Range (MHz): 1-300 MHz

ID-B (in/mm): 3/76.2

OD-A (in/mm): 4/101.6

Height-C (in/mm): 1/25.4

Weight (oz/gm): 420

Initial permeability: 1500

(4″ OD, 3″ ID hole), available in mix 31 only, Case of 25

Excellent for large cables or multiple cables – use multiple cores for higher choking. Also useful when you need high turns count for high choking with large cable - works on AC or DC power lines and also coax cable lines.

12:1 Baluns are useful between 600-650 ohm balanced loads the impedance at the end of the feed line is 600 ohms (1/2 wavelength feed line), or high impedance feeds for rhombic, T2FD and traveling wave antennas.

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.