(0)H03J:0/1:

(0)H03J:0/1:

IPC6

SECTION H - ELECTRICITY

TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS

H03J

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H03J001/00 - H03J003/32

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

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]

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

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