Switchable, true 1:1 or 4:1 current balun/unun.
Transmission line transformer using low-permeability ferrite cores gives amazingly flat response 1.8 to 30 MHz.
Easily handles 300 Watts.
Transforms 200 or 50 Ohm balanced or unbalanced loads to 50 Ohms.
Posted by N9SIU on 26th Jul 2015
I have been using the MFJ-911H switchable balun 1:1 or 4:1 for QRP on 20 meters with the MFJ-1778M G5RV Junior antenna. It is small in size and very easy to use. You can download the manual from MFJ's website. I recommend this balun for it's potability and great performance.