These baluns and ununs can be used for impedance matching and also as End Fed halfwave antenna matching transformers to 50 or 75 ohm coax cable.
Big Clamp On RFI Noise Filter for AC/DC power lines, Coax/Multi-wire cable - 1" ID
Product Details
MPN: BCO31
Type: New
Country/Region of Manufacture: United States
RFI Range (MHz): 1-300 MHz
ID-B (in/mm): 1/25.2
Weight (oz/gm): 8
Initial permeability: 1500
1″ ID hole available in mix 31 only
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.