DIFF Subgroup
H03J 7/02 Automatic frequency control (H03J7/18 takes precedence)
Introduced: January 1980
Title
Titles differ between systems:
IPC: Automatic frequency control
CPC: Automatic frequency control (H03J7/18 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Automatic frequency control; Automatic scanning over a band of frequencies > Automatic frequency control
CPC:
Automatic frequency control; Automatic scanning over a band of frequencies > Automatic frequency control (H03J7/18 takes precedence)
Of 4 combined children, 2 exist in both systems.
2 codes are CPC-only extensions.
IPC defines codes here since 1980.
Child Classifications
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- H03J 7/04 where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant since 1980 +3 CPC IPC+CPC Available in IPC and CPC
- H03J 7/16 where the frequency control is accomplished by mechanical means, e.g. by a motor since 1980 IPC+CPC Available in IPC and CPC