where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element

Introduced: January 1980

Full Title

Automatic frequency control; Automatic scanning over a band of frequencies > Automatic scanning over a band of frequencies > where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element

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

2 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

Child Classifications

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H03J 7/22 in which an automatic frequency control circuit is brought into action after the scanning action has been stopped (H03J7/24 takes precedence) since 1980 IPC+CPC Available in IPC and CPC
H03J 7/24 using varactors, i.e. voltage variable reactive diodes (H03J7/28 takes precedence) since 1980 IPC+CPC Available in IPC and CPC
H03J 7/28 using counters or frequency dividers since 1980 +1 CPC IPC+CPC Available in IPC and CPC