by means of a variable reactive element

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Angle modulation (H03C5/00, H03C7/00 take precedence) > by means of variable impedance (H03C3/30 - H03C3/38 take precedence) > by means of a variable reactive element

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H03C 3/14 simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit
H03C 3/18 the element being a current-dependent inductor
H03C 3/20 the element being a voltage-dependent capacitor
H03C 3/22 the element being a semiconductor diode, e.g. varicap diode