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Modified over 3 years ago
Automatic Z-Match Greg P. Le Sage N6LYU May 2010
Outline What is a Z-Match? How does it compare to other tuners? Why automate? What's next? Demonstration
Harvey Wells Z-Match QST 1955 Reputation for very broad matching range Best for open-wire feedlines No balun Only 2 knobs No variable inductor
Original circuit used two coils Similar to L-Network Parallel LC tuned near resonance
Single coil version Extensive theoretical and experimental work over the years Very elegant circuit I skipped the series inductor
No automatic Z-match found Typical autotuner is an L-network with discrete components Opportunity to do something new Recycled my robot
Started with basic manual circuit Z-match is good candidate for automation: 2 knobs Followed on-line prescription for coil Used receiver type variable capacitors Test load is a 1k resistor
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Capacitor Arcing Experience was that rcvr caps are fine Tuning circuit is a resonator Arcing occurs on 80m Changing feedline length will hopefully avoid this problem
Parallax Basic Stamp Stepper motors Variable Capacitors Air wound coil Microstrip coupler
Added user configuration Select band: sets series capacitor Sweep through parallel capacitor values
What's Next? Use toroid instead of air coil – compact Discrete capacitors Sense frequency Remote to feedpoint – use coaxial line
Many examples on-line Most toroid Z-match units used for QRP No automatic versions found
N6LYU Automatic Z-Match Read details here: Source code, images, etc. Featured on The DXZone match-antenna-tuner.html Featured on Parallax.com hAntennaTuner/tabid/835/Default.aspx
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