GB636472A - Improvements in or relating to phase modulation transmission systems - Google Patents
Improvements in or relating to phase modulation transmission systemsInfo
- Publication number
- GB636472A GB636472A GB38160/46A GB3816046A GB636472A GB 636472 A GB636472 A GB 636472A GB 38160/46 A GB38160/46 A GB 38160/46A GB 3816046 A GB3816046 A GB 3816046A GB 636472 A GB636472 A GB 636472A
- Authority
- GB
- United Kingdom
- Prior art keywords
- modulated
- valve
- phase
- condenser
- multivibrator
- 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
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/04—Position modulation, i.e. PPM
Abstract
636,472. Phase modulation. BENDIX AVIATION CORPORATION. Dec. 31, 1946, No. 38160. Convention date, Jan. 18. [Class 40 (v)] For producing phase-modulated waves the square-wave output of a stabilized modulated multivibrator is differentiated and the resulting time-modulated train of pulses used to control the phase of a radio frequency wave. In one embodiment a flip-flop multivibrator 21, 22 is triggered by pulses, from a crystalcontrolled pulse generator, applied to the grid of valve 21 through condenser 35. The modulation voltage from source 40 is applied through condenser 36 and inductance 37 to the grid of valve 22. The square wave output from the anode of valve 21 has its negative-going edges modulated in time, and is differentiated in circuit 19. The resultant unmodulated positive pulses are clipped off and the modulated negative pulse train inverted and fed to a class C amplifier with a resonant anode circuit tuned to the pulse recurrence frequency. A phase modulated sine wave output results which may be frequency multiplied to produce the desired frequency for radiation. In another embodiment a synchronized free-running multivibrator is used and the inter-valve couplings are dimensioned as to cause operation to take place on a short straight portion of the discharge characteristic of the condenser which determines the modulation characteristic which is thus rendered linear.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US641945A US2470028A (en) | 1946-01-18 | 1946-01-18 | Pulse generation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB636472A true GB636472A (en) | 1950-05-03 |
Family
ID=24574506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB38160/46A Expired GB636472A (en) | 1946-01-18 | 1946-12-31 | Improvements in or relating to phase modulation transmission systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2470028A (en) |
| GB (1) | GB636472A (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2550816A (en) * | 1947-01-14 | 1951-05-01 | Jackson Edward Herber Theobald | Measurement of electrical amplitudes utilizing pulse time shifting |
| GB631678A (en) * | 1947-02-19 | 1949-11-08 | Graham John Scoles | Improvements relating to electronic timing circuits |
| US2644137A (en) * | 1948-07-01 | 1953-06-30 | Jackson Edward Herber Theobald | Cathode-ray tube voltmeter |
| US2683859A (en) * | 1949-01-12 | 1954-07-13 | Westinghouse Electric Corp | Range indicator |
| US2722601A (en) * | 1949-08-01 | 1955-11-01 | Electronique & Automatisme Sa | Electric impulse counting chains |
| US2718449A (en) * | 1949-09-23 | 1955-09-20 | Phillips Petroleum Co | Pulse measuring apparatus |
| US2577795A (en) * | 1949-12-30 | 1951-12-11 | Bell Telephone Labor Inc | Stabilized frequency-modulated multivibrator |
| US2831108A (en) * | 1953-02-26 | 1958-04-15 | Aircraft Armaments Inc | Signal generators |
| US2762914A (en) * | 1953-03-02 | 1956-09-11 | Sylvania Electric Prod | Trigger signal converter |
| US2950352A (en) * | 1953-08-26 | 1960-08-23 | Rensselaer Polytech Inst | System for recording and reproducing signal waves |
| US2859340A (en) * | 1953-11-02 | 1958-11-04 | Richard M Dunham | Monostable multivibrator circuit for variable load impedances |
| US2954528A (en) * | 1954-12-10 | 1960-09-27 | Ibm | Monostable multivibrator |
| US2894128A (en) * | 1954-12-24 | 1959-07-07 | Ibm | Mono-stable multivibrator |
| US2906963A (en) * | 1955-09-29 | 1959-09-29 | Alfred A Wolf | Polypulse generator |
| US2889457A (en) * | 1956-04-09 | 1959-06-02 | Itt | Triggered pulse generator |
| US2892980A (en) * | 1956-06-04 | 1959-06-30 | Holzer Johann | Binary pulse modulator |
| US3020417A (en) * | 1957-03-11 | 1962-02-06 | Itt | Transistor multivibrator |
| US2995668A (en) * | 1958-10-14 | 1961-08-08 | Lab For Electronics Inc | Compensated transistor trigger circuit |
| FR1299707A (en) * | 1961-06-16 | 1962-07-27 | Bull Sa Machines | Monostable or self-timer device |
| US3290617A (en) * | 1962-07-09 | 1966-12-06 | Northern Electric Co | Frequency modulated relaxation oscillator |
| US3568094A (en) * | 1968-08-23 | 1971-03-02 | Eastman Kodak Co | Pulse width modulator |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE428656A (en) * | 1937-06-18 | |||
| US2227596A (en) * | 1938-03-31 | 1941-01-07 | Rca Corp | Signaling system |
| GB523575A (en) * | 1939-01-06 | 1940-07-17 | Kolster Brandes Ltd | Improvements in or relating to methods of generating pulses characteristic of sound and like waves |
| US2280707A (en) * | 1940-05-31 | 1942-04-21 | Rca Corp | Apparatus for and method of frequency modulating |
| BE465456A (en) * | 1944-07-17 |
-
1946
- 1946-01-18 US US641945A patent/US2470028A/en not_active Expired - Lifetime
- 1946-12-31 GB GB38160/46A patent/GB636472A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2470028A (en) | 1949-05-10 |
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