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5. Impedance Matching.
By David Knight and Nigel Williams.

Contents
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.

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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