GB594659A - Electric-pulse generator suitable for use in pulse communication systems - Google Patents
Electric-pulse generator suitable for use in pulse communication systemsInfo
- Publication number
- GB594659A GB594659A GB17541/44A GB1754144A GB594659A GB 594659 A GB594659 A GB 594659A GB 17541/44 A GB17541/44 A GB 17541/44A GB 1754144 A GB1754144 A GB 1754144A GB 594659 A GB594659 A GB 594659A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- line
- potential
- pulse
- current
- 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
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback
- H03K3/16—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using a transformer for feedback, e.g. blocking oscillator with saturable core
Abstract
594,659. Pulse generating and modulating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Sept. 13, 1944, No. 17541. Convention date, April 10, 1943. [Class 40 (v)] In a pulse generator a delay line is associated with a thermionic valve, the flow of current in the valve initiating a potential wave which is propagated down the line and reflected to produce at the transmitting end an increased potential to terminate the flow of current in the valve. Coupled coils 11, 12 in the anode and grid circuits of valve 1 ensure rapid increase of current, the line L being connected between the cathode and earth and terminated by a valve 2 which acts as a variable resistance. As the line L discharges through valve 2 the cathode potential falls until valve 1 conducts, the anode current in coil 12 inducing a voltage in coil 11 which is applied to the grid of valve 1 to cause a rapid increase in the anode current. The cathode of valve 1 is driven positive rapidly, a positive wave being sent down line L to the valve 2 which presents a resistance greater than the characteristic impedance of the line L so that the wave is reflected to increase the potential on the cathode of valve 1, thereby cutting off the anode current, the line L discharging through valve 2 to complete a cycle. The coupling coil 13 feeds the pulse produced by the flow of anode current through coil 12, to a pulse amplifier 10 feeding a magnetron 16. To minimize the effects of variations in the supply voltage, the screen grid of valve 2 is fed through a resistance-condenser combination (i, 8 having the same time constant as the combination comprising the condenser C1 and the effective resistance of the screen grid circuit. The screen potential of valve 1 may be stabilized by a neon tube. For pulse modulation purposes, an audioamplifier 3 varies the grid potential of valve 2, the line L being discharged at a greater or lesser rate to vary the interval between pulses.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US594659XA | 1943-04-10 | 1943-04-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB594659A true GB594659A (en) | 1947-11-17 |
Family
ID=22023131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17541/44A Expired GB594659A (en) | 1943-04-10 | 1944-09-13 | Electric-pulse generator suitable for use in pulse communication systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB594659A (en) |
-
1944
- 1944-09-13 GB GB17541/44A patent/GB594659A/en not_active Expired
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