(under the class definition) Subject matter wherein the inductance and capacitance of the tuned circuit is of the distributed parameter type and is adapted to have the mean resonant frequency of the circuit adjusted in discrete, distinct steps; or where a plurality of tuned circuits are ganged together either mechanically and/or electrically so as to have their means resonant frequency adjusted in unison.
(1) Note. Resonators, which are closely analogous to tuners found in this subclass, are classified in Class 333, Wave Transmission Lines and Networks, especially subclasses 219+. The resonators found in Class 333, subclasses 219+ comprise conductive enclosures, cavities, or wave transmission line sections of the two terminal type and have both distributed inductance and capacitance. Even though a resonator may be provided with tuning means and designated as a tuner, if the resonator is a single circuit having both inductance and capacitance of the distributed parameter type with the adjustment of the resonant frequency being of a continuous, unbroken type, classification is in Class 333, Wave
Transmission Lines and Networks, subclasses 219+. Single circuits in which only the inductance and capacitance is of the distributed type are classified in this subclass and the indented subclasses thereunder. See also the notes under Class 333, subclasses 167 and 219.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1+, especially subclass 3 for a resonator type tuner combined with some other type tuner such as, for example, a lumped inductor-capacitor circuit.
SEE OR SEARCH CLASS
219, Electric Heating, 750, for microwave heating with tuned circuits.
315, Electric Lamp and Discharge Devices: Systems,
5.46+, for cathode-ray tube circuits in which the cathode ray passes through plural hollow distributed parameter devices that are tunable; subclasses 5.53+ for circuits in which the cathode ray passes through a tunable hollow distributed parameter device, and subclasses 39.55+ for distributed parameter resonator type magnetrons having variable tuning means.
330, Amplifiers,
45, for a linear amplifier having an electron beam vacuum tube coupled to a cavity resonator; subclass 49 for a linear amplifier having a vacuum tube amplifying device which has distributed parameter characteristics which may involve a resonator, and subclass 56 for linear amplifiers involving wave guide, cavity, or concentric line resonator coupling generally.
331, Oscillators,
5, 6+, 9, 79+, 86+, 93, and 96+ for oscillators which have a distributed parameter resonator.
332, Modulators,
129+, for resonators in a frequency modulator and subclasses 163+ for resonators in an amplitude modulator.
333, Wave Transmission Lines and Networks,
219+, for resonators of the distributed parameter type, per se. See (1) Note above.
343, Communications: Radio Wave Antennas, 723, for single adjustable length electrically long linear antennae; subclasses 745+ for antennae with a variable
reactance for tuning the antenna; subclasses 746 and 767+ for slot type antennae which may involve resonator structure; subclasses 790+ for sleeve type antennae; subclasses 793+ for balanced doublet type antennae which may have resonant characteristics, and subclasses 825+ and 843 for antennae having appreciable wave length dimensions.
455, Telecommunications,
120+, for transmitters involving wave filters, subclasses 150.1+ for receivers with filters or tuners and subclasses 78+ for wave meters using tuners or filters.
