History: 3kW -40dB HF Coupler

Source of version: 11 (current)

Just some lab notes during construction: !!!L/C meter measures Binocular transformer: L1=1.578uH (2 T), L2=160.2uH (20-21 T) Mystery toroid: 186.8uH (25T) Mystery toroid: 0.315uH (1T through core) T80-52D toroid: 16.67uH (14T) 2-30MHz toroid: 9.25uH (37T) Shell tansformer: L1=2.456uH (?T), L2=0.244uH (1T) Giant toroid: 56uH (19T) !!!VNA measures @ 1MHz Binocular transformer: L1=1.55uH (2 T), L2=148-200uH (20-21 T) (hard to measure / poor contacts) Mystery toroid: 200uH (25T) Mystery toroid: 0.4uH (1T through core) T80-52D toroid: 15.3uH (14T) 2-30MHz toroid: 9.27uH (37T) Shell tansformer: L1=2.38uH (?T), L2=0.185uH (1T) Giant toroid: 53uH (19T) !!!Primary Inductance Good primary coupling when Zpri >= 4*Zsource. Zsource=50 ohms, ∴ Zpri >= 200 ohms. f(min) = 1MHz, ∴ Lpri(min) = 31.8uH Not that good coupling is the goal here. In fact, it's the opposite.

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