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

Introduced: September 1968

Title

Titles differ between systems:

IPC: by means of variable impedance

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

Full titles differ between systems:

IPC:

Angle modulation > by means of variable impedance

CPC:

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

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

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H03C 3/12 by means of a variable reactive element IPC+CPC Available in IPC and CPC
H03C 3/24 by means of a variable resistive element, e.g. tube +1 CPC IPC+CPC Available in IPC and CPC
H03C 3/28 using variable impedance driven mechanically or acoustically IPC+CPC Available in IPC and CPC