GB589659A - Improvements in piezoelectric crystal arrangements - Google Patents
Improvements in piezoelectric crystal arrangementsInfo
- Publication number
- GB589659A GB589659A GB20103/44A GB2010344A GB589659A GB 589659 A GB589659 A GB 589659A GB 20103/44 A GB20103/44 A GB 20103/44A GB 2010344 A GB2010344 A GB 2010344A GB 589659 A GB589659 A GB 589659A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crystal
- frequency
- harmonic
- frequency modulation
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F11/00—Dielectric amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/10—Angle modulation by means of variable impedance
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C7/00—Modulating electromagnetic waves
- H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Transmitters (AREA)
Abstract
589,659. Frequency modulation. WESTERN ELECTRIC CO., Inc. Oct. 17, 1944, No. 20103. Convention date, Oct. 21, 1943. [Class 40 (v)] [Also in Group XXXV] A potential-varied capacity is provided by a piezo-electric crystal such as Rochelle salt, sodium rubidium tartrate, sodium thallium tartrate, ammonium dihydrogen phosphate, potassium dihydrogen phosphate, and the corresponding arsenates or mixtures thereof, maintained at its Curie point temperature and non-resonant with respect to the frequency of the circuit in which it is connected. Such a crystal exhibits hysteresis effects and a considerable change of dielectric constant with change of applied voltage, and may be used for frequency modulation, harmonic production, or automatic tuning. The crystal is preferably of heavy-water Rochelle salt which has a convenient Curie point temperature. The frequency generated by a velocitymodulation tube is modulated by such a crystal 3, Fig. 4, with electrodes 4, 5 connected in the inner conductor 7 of the line 23 coupling the buncher and catcher resonators 21, 22, the coupling loops 24 being connected to the resonators through small condensers 24a. The modulating potentials from source 25 are applied to the crystal electrodes 4, 5 through the low- or band-pass filter 27, 28, 29. In a second embodiment, Fig. 5 (not shown), the crystal is connected across a coaxial line resonator associated with a triode oscillator to modulate its resonant frequency. As a harmonic producer, the crystal 3, 4, 5, Fig. 6, is connected across a sinusoidal wave source 50, 51, 52, the voltages produced by the crystal being applied to triode 53 in whose output circuit is a circuit 54, 55 tuned to the desired harmonic frequency. In a further application, the motor-driven tuning capacitor of a frequency modulation transmitter of the type described in Specification 546,677 is replaced by potential-varied crystal capacity. Specifications 362,377, 451,098, 531,841. and 535,507 also are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US507130A US2453243A (en) | 1943-10-21 | 1943-10-21 | Frequency modulating and harmonic producer apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB589659A true GB589659A (en) | 1947-06-26 |
Family
ID=24017379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20103/44A Expired GB589659A (en) | 1943-10-21 | 1944-10-17 | Improvements in piezoelectric crystal arrangements |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2453243A (en) |
| GB (1) | GB589659A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2625650A (en) * | 1948-10-16 | 1953-01-13 | Sperry Corp | Superregenerative apparatus |
| US2648823A (en) * | 1950-01-06 | 1953-08-11 | Bell Telephone Labor Inc | Thermoelectric translation device |
| US3002159A (en) * | 1957-12-30 | 1961-09-26 | Daystrom Inc | Oscillator |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1894687A (en) * | 1930-12-08 | 1933-01-17 | Eclipse Aviat Corp | Piezo-electric crystal temperature control |
| US2071564A (en) * | 1930-12-30 | 1937-02-23 | Communications Patents Inc | Cyclic variable frequency oscillator |
| US2182377A (en) * | 1937-05-01 | 1939-12-05 | Radio Patents Corp | Method and means for tuning electric oscillatory circuits |
| US2191315A (en) * | 1937-11-25 | 1940-02-20 | Radio Patents Corp | Electric translation circuit |
| US2188154A (en) * | 1938-08-04 | 1940-01-23 | Bell Telephone Labor Inc | Piezoelectric substance and process for producing it |
| US2230649A (en) * | 1938-09-03 | 1941-02-04 | Bell Telephone Labor Inc | Variable electric capacity device |
| US2256931A (en) * | 1939-09-26 | 1941-09-23 | Bliley Electric Company | Piezoelectric crystal oscillator |
| US2306555A (en) * | 1940-05-23 | 1942-12-29 | Research Corp | Method for frequency control |
| US2298085A (en) * | 1941-04-02 | 1942-10-06 | Bell Telephone Labor Inc | Piezoelectric oscillator |
-
1943
- 1943-10-21 US US507130A patent/US2453243A/en not_active Expired - Lifetime
-
1944
- 1944-10-17 GB GB20103/44A patent/GB589659A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2453243A (en) | 1948-11-09 |
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