1:1 and 4:1 Current Balun Measurements

Normal

As expected, the SWR and Impedance are flat line traces.

Center Conductor Short without Balun

As expected, the SWR and Impedance are unacceptable.

Center Conductor Short with Balun

With five Palomar FSB-1/4 Ferrite Split Beads, the Balun has acceptable performance at about 6 MHz and above.

FT140-43 Dual Core 4:1 Current Balun with one lead shorted

This Balun is good from about 3.5 MHz (SWR = 1.1) and up. FT140-43 Balun with 9T

Plot with limit unbalance.

20 MHz with limit unbalance.

FT140-61 Dual Core 4:1 Current Balun with one lead shorted

FT140-61 Balun with 9T

Normal plot

Plot with limit unbalance.

BN43-202 with 1:1 Baluns on both cores

Normal plot

Plot with limit unbalance.

BN43-202 with each 1:1 Baluns on separate core

Normal plot

Plot with limit unbalance.

BN43-7051 3T 4:1 Balun

Plot with limit unbalance.

RG-8X Coax Coil Balun, 4" diameter, 10 Turns

Limit unbalance at 1.1:1 SWR 4 MHz.

Five FB-43-1020 Beads