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Efficiency of 200-ohm hairpin matching
K7ITM wrote:
Is it possible to lengthen the D.E., causing it to present an inductive reactance at the feedpoint, and match that (to 200 ohms, or to 50 ohms) with a shunt capacitance? That may work better, giving a broader SWR bandwidth.... Good, constructive suggestion, Tom. Kudos for putting in a bit of design/analysis effort on this rather than just shooting from the hip. This is definitely a weird way of driving a yagi. It makes me yearn for the old TV-antenna schemes that used folded dipoles for the driven element, suitably split-up between upper and lower wires so as to give a 300-ohm terminal impedance even with the resistance-lowering effects of the reflector and directors. Jim, K7JEB |
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