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Part 1: Basic principles.
Z-plane operations. Series reactance and resistance. Parallel
impedance. Admittance, conductance, and susceptance. The equation
of a circle. Parallel Resistance (constant susceptance). Parallel
reactance (constant conductance). Transformers ('constant' phase).
Impedance matching strategies. Z-plane regions. Part 2: Popular matching networks. The Pi-network. Fully variable Pi-match. L-match. Switched inductor Pi-match. Tapped inductor with interpolation capacitor. T-match. Reciprocal L-network. Switched inductor T-match. Differential-T match. "Ultimate" Transmatch? SPC Transmatch. Part 3: L-network solutions. Overview. Idealised network solutions. Component range calculations. Lossy networks. Efficiency. Part 4: Practicalities of matching network design. Materials and components. Variable inductors. General considerations. References. Appendix: MFJ989C Versatuner modifications . The SGC 230 Automatic ATU. Collins 180L-series atomatic antenna tuners. |
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Antenna
impedance calculator and L-network matching solution finder
by Alexandr Fediaev (Windows program, .zip file - 18.6 MiB) Converts results obtained using W2AEW Alan Wolke's bridge + oscilloscope method to impedance, displays this as a point on the Z-plane and calculates the shortest path L-network solution for a match to 50 Ω. You can contact Alexandr via his YouTube account. |
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