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DIFF Main Group
H03D 7/00

Transference of modulation from one carrier to another, e.g. frequency-changing (H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Transference of modulation from one carrier to another, e.g. frequency-changing

CPC: Transference of modulation from one carrier to another, e.g. frequency-changing (H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F)

Full Title

Full titles differ between systems:

IPC:

Transference of modulation from one carrier to another, e.g. frequency-changing

CPC:

Transference of modulation from one carrier to another, e.g. frequency-changing (H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F)

Of 9 combined children, 8 exist in both systems.

1 codes are CPC-only extensions.

5 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • H03D 7/005 CPC only CPC only
  • H03D 7/18 Modifications of frequency-changers for eliminating image frequencies IPC+CPC Available in IPC and CPC
  • H03D 7/20 by means of transit-time tubes IPC+CPC Available in IPC and CPC
  • H03D 7/22 by deflecting an electron beam in a discharge tube (H03D7/20 takes precedence) IPC+CPC Available in IPC and CPC