GB504238A - Improvements in or relating to ultra high frequency apparatus - Google Patents
Improvements in or relating to ultra high frequency apparatusInfo
- Publication number
- GB504238A GB504238A GB19177/38A GB1917738A GB504238A GB 504238 A GB504238 A GB 504238A GB 19177/38 A GB19177/38 A GB 19177/38A GB 1917738 A GB1917738 A GB 1917738A GB 504238 A GB504238 A GB 504238A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- diaphragm
- modulation
- oscillator
- vary
- 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
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/10—Angle modulation by means of variable impedance
- H03C3/28—Angle modulation by means of variable impedance using variable impedance driven mechanically or acoustically
Landscapes
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
504,238. Modulating - - apparatus. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. June 28, 1938, No. 19177. Convention date, July 28,1937. [Classes 40 (iii) and 40 (v)] Modulation of an ultra high frequency is effected by varying, in accordance with the modulation, a resonant line which is employed for stabilization of the oscillator. The outer or inner member 15 or 17 of the concentric resonant line 13 is made of magnetostrictive material, and modulation currents from source 23 applied to the solenoid 21 vary the effective length of the line by varying the capacity between the armature 19 and the end of the outer member 15 and, in consequence, the frequency of the oscillator 25 which is coupled to the line is modulated. The member 15 may be slotted to reduce eddy currents. The diaphragm at the end of the line may be bi-metallic, one of the metals being magneto-strictive, Fig. 3 (not shown). A solenoid energized by modulation currents is placed adjacent the diaphragm which bulges and so varies the effective capacity of the line. The Specification as open to inspection under Sect. 91 comprises also an arrangement in. which the diaphragm is not magneto-strictive and is influenced by a solenoid. carrying an intermediate carrier frequency, amplitude modulated with the signals. Reaction between the magnetic field and eddy current in the diaphragm produce movement of the diaphragm which, however, due to its inertia, is only able to follow the signal frequency variations. In another arrangement, a piezo-electric crystal, whose dimensions are varied by modulating potentials, is employed to vary the capacity between the inner and outer members of the line ; or the end of the outer member of the line may comprise an acoustic diaphragm upon which sound waves are impressed directly. The invention is applicable to the control of the local oscillator of a superheterodyne radio receiver employing automatic tuning; and may be applied to vary the coupling between an oscillator and its load to obtain amplitude modulation. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US156054A US2174701A (en) | 1937-07-28 | 1937-07-28 | Ultra high frequency modulator |
| US232629A US2217280A (en) | 1937-07-28 | 1938-09-30 | Ultra high frequency modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB504238A true GB504238A (en) | 1939-04-21 |
Family
ID=26852829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19177/38A Expired GB504238A (en) | 1937-07-28 | 1938-06-28 | Improvements in or relating to ultra high frequency apparatus |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2217280A (en) |
| GB (1) | GB504238A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE968052C (en) * | 1942-01-29 | 1958-01-09 | Sperry Rand Corp | Electron tubes with a reentering cavity resonator |
| NL115301B (en) * | 1942-09-24 | |||
| DE945040C (en) * | 1943-06-02 | 1956-06-28 | Siemens Ag | Device for tuning a cavity resonator |
| US2640964A (en) * | 1945-05-09 | 1953-06-02 | Freedman Samuel | Microwave modulation |
| US2490968A (en) * | 1946-07-30 | 1949-12-13 | Rca Corp | Ultra high frequency transmitter |
| US2773996A (en) * | 1946-09-13 | 1956-12-11 | Slater John Clarke | Transducer for producing sound at microwave frequencies |
| US2574647A (en) * | 1947-04-12 | 1951-11-13 | Electronic Systems Corp | Magnetostrictive modulator |
| US2484636A (en) * | 1947-09-26 | 1949-10-11 | Bell Telephone Labor Inc | Modulation system |
| US2577146A (en) * | 1948-05-28 | 1951-12-04 | Rca Corp | Method of and system for modulating microwave energy |
| US2711514A (en) * | 1948-10-27 | 1955-06-21 | Rines Robert Harvey | Wave guide modulation system |
| BE502649A (en) * | 1950-04-20 | |||
| US2738386A (en) * | 1951-07-17 | 1956-03-13 | Rca Corp | Magnetostrictive amplifier |
| US3188584A (en) * | 1959-06-10 | 1965-06-08 | Telefunken Ag | High-frequency piezoelectric system |
-
1938
- 1938-06-28 GB GB19177/38A patent/GB504238A/en not_active Expired
- 1938-09-30 US US232629A patent/US2217280A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2217280A (en) | 1940-10-08 |
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