Model validation - FT240-61-35t

Martin, G8JNJ constructed a balun using 35 turns on a FT240-61 core and measured the choking impedance using AIM470.

Fig 1:

Fig 1 shows the modelled Rcm, Xcm and Zcm, and measured Rcm, Xcm and Zcm. The model was calibrated with 1.3pF of shunt capacitance to exhibit a resonance at about the same frequency as the measured balun. The measured R and X value is a little higher than the model above resonance, converging with increasing frequency. Otherwise there is close agreement between model and measurement.

Changes

Version	Date	Description
1.01	14/04/2009	Initial.
1.02
1.03
1.04
1.05