antenna.barko.devby Rothammel

matchingbalunsymmetry

Balun Calculator

Calculate broadband balun transformer

Source: Rothammel, Vol. 1, Ch. 6.8, p. 116

Input Parameters

Frequency

MHz

Impedance Ratio (1, 4, or 9)

Core Diameter (toroid OD)

mm

Wire Diameter

mm

Results

Number of Turns

10

Wire Length

1.57m

Suggested Core Mix (µ)

43

Minimum Frequency

6.33MHz

Maximum Frequency

31.64MHz

Diagram