1:1 Choke Balun with 43 Material

CMRR versus Inductance

Measurements
FT140-43 7T 46uH FT114-43 11T 62uH FT240-43 10T 113uH BN43-7051 3.5T 118uH

Common Mode Fixture

Fixture Schematic

Measurements
With 10:1 Transformer Fixture
Elecraft BL2 1:1 32uH FT114A-43 9T 69uH 643626402 4.5T 87uH FT114A-43 12T 125uH