The dominant Ferrite 43 material core loss is a result of magnetizing admittance. Where Admittance, Y = 1/Z(Ω) at a given frequency. Complex Z(Ω) is computed using inductance value and Fair-Rite Permeability (CSV) file for 43 Material.

μ_{i} = Initial Permeability

Lμ_{i} = uH at Initial Permeability

F = Frequency MHz

μ' μ" = Complex Permeability at F, from Fair-Rite CSV file

L = Lμ_{i} * (μ' / μ_{i})

X_{s} = 2π * F * L

Q = μ' / μ"

R_{s} = X_{s} / Q

Z = R_{s} + i * X_{s}

Y = 1 / Z

Magnetizing admittance is the real part of the complex admittance Y.
Fractional loss equals load admittance divided by sum of load and core magnetizing admittance.
The equation for a 50 Ohm load is:

fractional loss = 0.02 / (0.02 + Re(Y))

dB=10*log10(fractional loss)

Inductance at initial permeability ~= 3 uH

Measured Loss at 13.5 MHz = 1.39 dB

Mismatch loss for SWR 1.56 = 0.22 dB

Measured Loss minus Mismatch Loss = 1.17 dB

Plotted loss for Initial permeability of 3 uH ~= 1.3 dB

Measured Loss at 13.5 MHz = 1.39 dB

Mismatch loss for SWR 1.56 = 0.22 dB

Measured Loss minus Mismatch Loss = 1.17 dB

Plotted loss for Initial permeability of 3 uH ~= 1.3 dB

Inductance at initial permeability ~= 44 uH

Measured Loss at 13.5 MHz = 0.14 dB

Mismatch loss for SWR 1.20 = 0.036 dB

Measured Loss minus Mismatch Loss = 0.104 dB

Plotted loss for Initial permeability of 44 uH ~= 0.1 dB

Measured Loss at 13.5 MHz = 0.14 dB

Mismatch loss for SWR 1.20 = 0.036 dB

Measured Loss minus Mismatch Loss = 0.104 dB

Plotted loss for Initial permeability of 44 uH ~= 0.1 dB

Inductance at initial permeability = 4.29 uH

Inductance at initial permeability = 23.6 uH

Inductance at initial permeability = 23.6 uH