|  | H |
SECTION H — ELECTRICITY

|  | H03 |
BASIC ELECTRONIC CIRCUITRY

|  | H03J |
TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS (indicating arrangements for measuring Fulltext... Hierarchy... Expanded...G01D; measuring, testing Fulltext... Hierarchy... Expanded...G01R; remote-control in general Fulltext... Hierarchy... Expanded...G05, Fulltext... Hierarchy... Expanded...G08; control of generators Fulltext... Hierarchy... Expanded...H03B)

|  | H03J 1/00 |
Details of adjusting, driving, indicating, or remote-control arrangements for resonant circuits in general (machine elements in general Fulltext... Hierarchy... Expanded...F16; coupling of knobs to shafts Fulltext... Hierarchy... Expanded...F16D)

|  | H03J 1/02 |
· | Indicating arrangements

|  | H03J 1/04 |
· · | with optical indicating means

|  | H03J 1/06 |
· | Driving or adjusting arrangements; Combined with other driving or adjusting arrangements, e.g. of gain control

|  | H03J 1/08 - H03J 1/12 |
Note(s) Groups Fulltext... Hierarchy... Expanded...H03J 1/14, Fulltext... Hierarchy... Expanded...H03J 1/16 take precedence over groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...H03J 1/08-H03J 1/12.

|  | H03J 1/08 |
· · | Toothed-gear drive; Worm drive

|  | H03J 1/10 |
· · | Rope drive; Chain drive

|  | H03J 1/12 |
· · | Friction drive

|  | H03J 1/14 |
· · | Special arrangements for fine and coarse tuning

|  | H03J 1/16 |
· · | Single control means independently performing two or more functions

|  | H03J 1/18 |
· | Control by auxiliary power

|  | H03J 1/20 |
· · | the auxiliary power being switched on as long as controlling current is switched on

|  | H03J 1/22 |
· · | with stepping arrangements actuated by control pulses

|  | H03J 3/00 |
Continuous tuning (combination of continuous and discontinuous tuning other than for bandspreading Fulltext... Hierarchy... Expanded...H03J 5/00)

|  | H03J 3/02 |
· | Details

|  | H03J 3/04 |
· · | Arrangements for compensating for variations of physical values, e.g. temperature (automatic control of ambient conditions Fulltext... Hierarchy... Expanded...G05D)

|  | H03J 3/06 |
· · | Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges (automatic gain control Fulltext... Hierarchy... Expanded...H03G)

|  | H03J 3/08 |
· · · | by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter

|  | H03J 3/10 |
· · | Circuit arrangements for fine tuning, e.g. bandspreading

|  | H03J 3/12 |
· · | Electrically-operated arrangements for indicating correct tuning

|  | H03J 3/14 |
· · · | Visual indication, e.g. magic eye

|  | H03J 3/16 |
· · | Tuning without displacement of reactive element, e.g. by varying permeability

|  | H03J 3/18 |
· · · | by discharge tube or semiconductor device simulating variable reactance

|  | H03J 3/20 |
· | of single resonant circuit by varying inductance only or capacitance only

|  | H03J 3/22 |
· | of single resonant circuit by varying inductance and capacitance simultaneously

|  | H03J 3/24 |
· | of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning

|  | H03J 3/26 |
· · | the circuits being coupled so as to form a bandpass filter

|  | H03J 3/28 |
· | of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range

|  | H03J 3/30 |
· · | Arrangements for ensuring tracking with variable inductors

|  | H03J 3/32 |
· · | Arrangements for ensuring tracking with variable capacitors

|  | 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 (for bandspreading Fulltext... Hierarchy... Expanded...H03J 3/10)

|  | H03J 5/02 |
· | with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings

|  | H03J 5/04 |
· · | operated by hand

|  | H03J 5/06 |
· · · | Settings determined by single indexing means with snap action

|  | H03J 5/08 |
· · · | Settings determined by a number of separately-actuated positioning means

|  | H03J 5/10 |
· · · | 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

|  | H03J 5/12 |
· · · | Settings determined by a number of separately-actuated driving means which adjust the tuning element directly to desired settings

|  | H03J 5/14 |
· · | operated by auxiliary power

|  | H03J 5/16 |
· · · | Settings determined by a number of separate positioning means actuated by hand

|  | H03J 5/18 |
· · · | Settings determined by a number of separate positioning means actuated by electromagnets

|  | H03J 5/20 |
· · · | 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

|  | H03J 5/22 |
· · · | Settings determined by a number of separately actuated driving means which adjust the tuning element directly to desired settings

|  | H03J 5/24 |
· | 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 Fulltext... Hierarchy... Expanded...H01H)

|  | H03J 5/26 |
· · | operated by hand

|  | H03J 5/28 |
· · · | Tuning circuits or elements supported on a revolving member with contacts arranged in a plane perpendicular to the axis

|  | H03J 5/30 |
· · · | Tuning circuits or elements supported on a revolving member with contacts arranged in lines parallel to the axis

|  | H03J 5/32 |
· · · | Stationary tuning circuits or elements selected by push-button