IPC 6 English version H03J !A-H03J 9/06

H03J-H03J00906

SECTION H– ELECTRICITY

H 03

BASIC ELECTRONIC CIRCUITRY

H 03 J

TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS (indicating arrangements for measuring G 01 D; measuring, testing G 01 R; remote-control in general G 05, G 08; automatic control or stabilisation of generators H 03 L)

Note

This subclass covers also the control of tuning, including the combined control of tuning and other functions, e.g. combinations of tuning control and volume control, combinations of control of local oscillator and of supplementary resonant circuits. [3]

Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general (machine elements in general F 16; coupling of knobs to shafts F 16 D) [3]

Indicating arrangements

with optical indicating means

Driving or adjusting arrangements; combined with other driving or adjusting arrangements, e.g. of gain control

Note

Groups H 03 J 1/14, H 03 J 1/16 take precedence over groups H 03 J 1/08 to H 03 J 1/12.

Toothed-gear drive; Worm drive

Rope drive; Chain drive

Friction drive

Special arrangements for fine and coarse tuning

Single control means independently performing two or more functions

Control by auxiliary power

the auxiliary power being switched on as long as controlling current is switched on

with stepping arrangements actuated by control pulses

Continuous tuning (H 03 J 7/00, H 03 J 9/00 take precedence; combination of continuous and discontinuous tuning other than for bandspreading H 03 J 5/00) [3]

Details

Arrangements for compensating for variations of physical values, e.g. temperature (automatic control of ambient conditions G 05 D)

Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges (automatic gain control H 03 G)

by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter

Circuit arrangements for fine tuning, e.g. bandspreading

Electrically-operated arrangements for indicating correct tuning

Visual indication, e.g. magic eye

Tuning without displacement of reactive element, e.g. by varying permeability

by discharge tube or semiconductor device simulating variable reactance

of single resonant circuit by varying inductance only or capacitance only

of single resonant circuit by varying inductance and capacitance simultaneously

of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning

the circuits being coupled so as to form a bandpass filter

of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range

Arrangements for ensuring tracking with variable inductors

Arrangements for ensuring tracking with variable capacitors

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 (H 03 J 7/00, H 03 J 9/00 take precedence; for bandspreading H 03 J 3/10) [3]

with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings

operated by hand

Settings determined by single indexing means with snap action

Settings determined by a number of separately-actuated positioning means

Settings determined by a number of positioning means mounted on a common support, which is adjustable to desired positions, a different positioning means being in operation in each position

Settings determined by a number of separately-actuated driving means which adjust the tuning element directly to desired settings

operated by auxiliary power

Settings determined by a number of separate positioning means actuated by hand

Settings determined by a number of separate positioning means actuated by electromagnets

Settings determined by a number of positioning means actuated by a second means adjustable to different positions by the same or by a second auxiliary power

Settings determined by a number of separately actuated driving means which adjust the tuning element directly to desired settings

with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection, for television channel selection (switches in general H 01 H)

operated by hand

Tuning circuits or elements supported on a revolving member with contacts arranged in a plane perpendicular to the axis

Tuning circuits or elements supported on a revolving member with contacts arranged in lines parallel to the axis

Stationary tuning circuits or elements selected by push-button

Automatic frequency control; Automatic scanning over a band of frequencies [3]

Automatic frequency control (H 03 J 7/18 takes precedence; automatic tuning control for television receivers H 04 N 5/50) [3]

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 [3]

using counters or frequency dividers [3]

using varactors, i.e. voltage variable reactive diodes (H 03 J 7/06 takes precedence) [3]

Modification of automatic frequency control sensitivity or linearising automatic frequency control operation [3]

Combination of automatic frequency control voltage with stabilised varactor supply voltage [3]

Controlling the magnetic state of inductor cores (H 03 J 7/06 takes precedence) [3]

where the frequency control is accomplished by mechanical means, e.g. by a motor [3]

Automatic scanning over a band of frequencies [3]

where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element [3]

in which an automatic frequency control circuit is brought into action after the scanning action has been stopped (H 03 J 7/24 takes precedence) [3]

using varactors, i.e. voltage variable reactive diodes (H 03 J 7/28 takes precedence) [3]

in which an automatic frequency control circuit is brought into action after the scanning action has been stopped [3]

using counters or frequency dividers [3]

where the scanning is accomplished by mechanical means, e.g. by a motor [3]

with simultaneous display of received frequencies, e.g. panoramic receivers [3]

Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification (mechanical remote-control arrangements H 03 J 1/00) [3]

using radio transmission; using near-field transmission [3]

using ultrasonic, sonic or infrasonic waves [3]

using electromagnetic waves other than radio waves, e.g. light [3]