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Class   331	OSCILLATORS
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94.1

MOLECULAR OR PARTICLE RESONANT TYPE (E.G., MASER)

1R

AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS

2

Plural oscillators controlled

3

Molecular resonance stabilization

4

Search sweep of oscillator

5

Magnetron oscillator

6

Klystron oscillator

7

Plural controls

8

Transistorized controls

9

Oscillator with distributed parameter-type discriminator

10

Plural A.F.S. for a single oscillator

11

Plural comparators or discriminators

12

With phase-shifted inputs

13

Motor control of oscillator

14

With intermittent comparison controls

15

Amplitude compensation

16

Tuning compensation

17

Particular error voltage control (e.g., intergrating network)

18

With reference oscillator or source

19

Spectrum reference source

20

T.V. sync type

21

Lock to power line

22

Plural significant heterodyne stages

23

Sensing modulation (e.g., frequency modulation controlled oscillator

24

With motor comparator

25

Signal or phase comparator

26

Plural diode type

27

Plural active element (e.g., triodes)

28

Unilateral element (e.g., diode)

29

Electromechanical

30

With stable heterodyne oscillator or source

31

Plural significant heterodyne stages

32

With particular discriminator (e.g., LPF and HPF)

33

Plural diode type

34

Particular frequency control means

35

Electromechanical (e.g., motor)

36R

Reactance device (e.g., variable capacitors, saturable inductors, reactance tubes, etc.)

36C

Capacitor controlled AFC

36L

Inductor controlled AFC

1A

AFC with logic elements

37

BEAT FREQUENCY

38

Plural beating

39

Single channel

40

Frequency or amplitude adjustment or control

41

Frequency stabilization

42

With particular signal combining means (e.g., cavity mixer)

43

With filter in mixer output circuit

44

WITH FREQUENCY CALIBRATION OR TESTING

45

POLYPHASE OUTPUT

46

PLURAL OSCILLATORS

47

Oscillator used to vary amplitude or frequency of another oscillator

48

Adjustable frequency

49

Selectively connected to common output or oscillator substitution

50

Cascade or tandem connected

51

Frequency dividers

52

Semiconductor (e.g., transistor)

53

Frequency multiplier

54

Diverse-type oscillators

55

Synchronized, triggered or pulsed

56

Parallel connected

57

RING OSCILLATORS

58

PLURAL FUNCTIONS SIMULTANEOUSLY

59

CONVERTIBLE (E.G., OSCILLATOR TO AMPLIFIER, ETC.)

60

SINGLE OSCILLATOR WITH PLURAL OUTPUT CIRCUITS

61

Plural outputs of diverse wave form

62

WITH OSCILLATOR CIRCUIT PROTECTIVE MEANS

63

PROTECTIVE OF SAFETY DEVICES FOR PERSONNEL

64

WITH INDICATOR, SIGNAL, OR ALARM

65

WITH DEVICE RESPONSIVE TO EXTERNAL PHYSICAL CONDITION

66

Temperature or light responsive

67

WITH ELECTROMAGNETIC OR ELECTROSTATIC SHIELD

68

WITH OUTER CASING OR HOUSING

69

With temperature modifier

70

WITH TEMPERATURE MODIFIER

71

RAW A.C. USED AS SOURCE OF POWER OR BIAS

72

ELECTRON-COUPLED TYPE

73

Piezoelectric crystal resonator

74

COMBINED WITH PARTICULAR OUTPUT COUPLING NETWORK

75

Space discharge or unilaterally conductive device in output network

76

Harmonic producing or selecting network

77

Wave filter

78

ELECTRICAL NOISE OR RANDOM WAVE GENERATOR

79

BEAM TUBE

80

With beam sweeping or deflecting means

81

With electron bunching or velocity variation means

82

Traveling wave type

83

Multicavity type (e.g., Klystron)

84

Reflex type (i.e., with repeller electrode)

86

WITH MAGNETICALLY CONTROLLED SPACE DISCHARGE DEVICE (E.G., MAGNETRON)

87

With particular pulsing means

88

With frequency stabilization

89

With secondary emissive electrode

90

With frequency adjustment

91

With undesired mode suppression or selection means

92

RETARDING FIELD TUBE-TYPE OSCILLATORS (E.G., BARKHAUSEN KURZ)

93

With distributed parameter resonator

95

BUTTERFLY RESONATOR

96

WITH DISTRIBUTED PARAMETER RESONATOR

97

Tube enclosed by resonator structure

98

Disk seal tube (e.g., lighthouse, pencil tube)

99

Parallel wire type

100

Push-pull type

101

Coaxial or shielded line type

102

Push-pull type

103

TUBE STRUCTURE FORMS INDUCTIVE PART OF RESONANT CIRCUIT

104

TRANSIT TIME OSCILLATOR

105

WITH PARASITIC OSCILLATION CONTROL OR PREVENTION MEANS

106

WITH PERIODOIC OR REPETITIOUS AMPLITUDE VARYING MEANS (E.G., TREMOLO)

107R

SOLID STATE ACTIVE ELEMENT OSCILLATOR

108R

Transistors

109

Amplitude stabilization and control

110

Bridge type

111

Relaxation oscillator

112

Blocking oscillator type

113R

Multivibrator type

113A

Saturable core controlled converters

113S

Converter using silicon control rectifiers

114

Push-pull

115

Negative resistance

116R

Electromechanical resonator controlled

116FE

Field-effect transistor active element

116M

Electromechanical resonators other than piezoelectric crystals

117R

L-C type

117FE

Field-effect transistor active element

117D

Distributed parameter resonator transistor oscillators

108A

Use of complimentary-type transistors

108B

Phase shift oscillator

108C

Integrated circuit oscillators

108D

Integrated modules with discrete elements oscillators

107DP

Significant distributed parameter resonator (e.g., cavity)

107P

Parallel-connected oscillator devices

107SL

Stripline type

107C

Coaxial type

107A

Acoustoelectric device oscillators

107G

Gunn-type bulk effect device oscillators

107S

Superconductive device oscillators

107T

Tunnel diode oscillators

126

GASEOUS SPACE DISCHARGE DEVICE

127

Spark or open arc type

128

Drives shock excited L.C. circuit

129

Relaxation oscillator

130

Plural gaseous devices

131

Discharge device or rectifier in "C" or "L" charging or discharging circuit

132

NEGATIVE RESISTANCE OR NEGATIVE TRANSCONDUCTANCE OSCILLATOR

133

Secondary emission (e.g., dynatron)

134

Transitron type

135

PHASE SHIFT TYPE

136

Zero phase shift

137

With R.C. ladder-type phase shift network

138

BRIDGE TYPE

139

Piezoelectric crystal in bridge

140

R.C. or R.L. type

141

Wien bridge

142

Double T bridge

143

RELAXATION OSCILLATORS

144

Multivibrators

145

With sync, triggering or pulsing circuit

146

Blocking oscillators

147

Using discharge device with plural grids

148

With 3 or more winding feedback transformers

149

With sync, trigger, or pulsing circuit (e.g., self-pulsing)

150

Output supplied to another discharge device circuit

151

Involving resonant or inductive wave forming circuit or transformer

152

Multi-grid discharge device in charged capacitor circuit

153

With sync, trigger or pulsing circuit

154

ELECTROMECHANICAL RESONATOR

155

With optical, piezoelectric or acoustic coupling means

156

Vibrating reed or string type (e.g., tuning fork)

157

Magnetostrictive

158

Crystal

159

Plural tube

160

With means to limit crystal current or voltage

161

With crystal substitution

162

Plural crystals in circuit

163

Crystal having three or more electrodes in circuit

164

Anode or cathode to grid crystal circuit

165

SHOCK EXCITED RESONANT CIRCUIT

166

With keying means of the active element type (e.g., burst generator)

167

L-C TYPE OSCILLATORS

168

Plural tubes

169

Anode to cathode coupled or connected resonant circuit

170

Anode to grid coupled or connected resonant circuit

171

Grid to cathode coupled or connected resonant circuit

172

WITH SYNCHRONIZING, TRIGGERING OR PULSING CIRCUITS

173

Triggering or pulsing (e.g., burst generators)

174

Self-quenched

175

FREQUENCY STABILIZATION

176

Temperature or current responsive means in circuit

177R

WITH FREQUENCY ADJUSTING MEANS

178

Cyclic frequency sweeping means (e.g., vibrato)

179

Step-frequency change (e.g., band selection, frequency-shift keying)

180

Reactance tube type

181

Variable inductance device (e.g., saturable core or adjustable vane inductor)

177V

With voltage sensitive capacitor

182

AMPLITUDE CONTROL OR STABILIZATION

183

Automatic

184

HAVING DISCHARGED DEVICE OR PARTICULAR CONSTRUCTION

185

WITH PARTICULAR SOURCE OF POWER OR BIAS VOLTAGE

186

Regulated

187

MISCELLANEOUS OSCILLATOR STRUCTURES

DIG2

PHASE LOCKED LOOP HAVING LOCK INDICATING OR DETECTING MEANS

DIG3

LOGIC GATE ACTIVE ELEMENT OSCILLATOR

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