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How to model a 6:1 ratio balun using NEC2
The model has to include a wideband, low-loss step-down transformer.
Which may or may not be a balun. Eg., a 300-ohm down to 50-ohm transformer. As Roy implies, such transformers are difficult to construct in practice because performance depends on source and load impedances. But very easy to incorporate in a mathematical model. Just divide line impedance R+jX by 6. Consequently, the model will not accurately predict what will happen in the real world unless terminating impedances are fully taken into account. A Spice simulation program is needed rather than an Eznec type. ---- Reg. |
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