TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS

Introduced: September 1968

Description

H03J covers devices and methods for adjusting the resonant frequency of LC circuits and selecting among multiple resonant circuits. This includes mechanical tuning mechanisms (variable capacitors, inductors), electronic tuning approaches (varactor diodes, voltage-controlled oscillators), and circuit selection switching. The class encompasses applications in radio receivers, transmitters, and frequency-selective filters where precise frequency control or channel selection is required. Related but separate classes handle specific oscillator designs (H03B) and general frequency control or synchronization circuits (H03L).

Of 6 combined children, 5 exist in both systems.

1 codes are CPC-only extensions.

Note: 1 CPC extensions are marked as secondary classification only.

3 shared codes have differing titles between IPC and CPC.

Child Classifications

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H03J 1/00 Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general +1 CPC IPC+CPC Available in IPC and CPC
H03J 2200/00 Indexing scheme relating to tuning resonant circuits and selecting resonant circuits 2nd only +39 CPC CPC only CPC only
H03J 3/00 Continuous tuning (H03J7/00, H03J9/00 take precedence; combination of continuous and discontinuous tuning other than for bandspreading H03J5/00) IPC+CPC Available in IPC and CPC
H03J 5/00 Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner (H03J7/00, H03J9/00 take precedence; for bandspreading H03J3/10) IPC+CPC Available in IPC and CPC
H03J 7/00 Automatic frequency control; Automatic scanning over a band of frequencies since 1980 IPC+CPC Available in IPC and CPC
H03J 9/00 Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification (mechanical remote-control arrangements H03J1/00 ) since 1980 +3 CPC IPC+CPC Available in IPC and CPC