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
FSB1/4
Ferrite Split Beads, the Balun has acceptable performance at about 6 MHz
and above.
FT14043 Dual Core 4:1 Current Balun with one lead shorted
 This Balun is good from about 3.5 MHz (SWR = 1.1) and up.
 FT14043 Balun choking Z with 9T at 3.5 MHz using Calculator = 1576 ohms
 3.5 MHz choking to load impedance ratio = 7.9:1

Plot with limit unbalance.

20 MHz with limit unbalance.

FT14061 Dual Core 4:1 Current Balun with one lead shorted
 FT14061 Balun choking Z with 9T at 20 MHz using Calculator = 1527 ohms
 20 MHz choking to load impedance ratio = 7.6:1

Normal plot

Plot with limit unbalance.

BN43202 with 1:1 Baluns on both cores
Normal plot

Plot with limit unbalance.

BN43202 with each 1:1 Baluns on separate core
Normal plot

Plot with limit unbalance.

BN437051 3T 4:1 Balun
Plot with limit unbalance.

RG8X Coax Coil Balun, 4" diameter, 10 Turns
 Balun choking Z at 6 MHz (~11 uh) = 415 ohms
 6 MHz choking to load impedance ratio = 8.3:1

Limit unbalance at 1.1:1 SWR 4 MHz.

Five FB431020 Beads
 Balun choking inductance at 4 MHz using
Chart = 3.2 uH x 5 = 16 uH
 Balun choking Z at 4 MHz = 402 ohms
 4 MHz choking to load impedance ratio = 8:1
