by means of variable impedance (H03C3/30 - H03C3/38 take precedence)

Full Title

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

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• H03C 3/12 by means of a variable reactive element
• H03C 3/24 by means of a variable resistive element, e.g. tube
• H03C 3/28 using variable impedance driven mechanically or acoustically