GB376154A - Improvements in or relating to radio and other high frequency transmitters - Google Patents
Improvements in or relating to radio and other high frequency transmittersInfo
- Publication number
- GB376154A GB376154A GB31585/31A GB3158531A GB376154A GB 376154 A GB376154 A GB 376154A GB 31585/31 A GB31585/31 A GB 31585/31A GB 3158531 A GB3158531 A GB 3158531A GB 376154 A GB376154 A GB 376154A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- circuit
- keying
- grid
- plate
- 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
- 238000010079 rubber tapping Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Toys (AREA)
- Selective Calling Equipment (AREA)
- Electrophonic Musical Instruments (AREA)
Abstract
376,154. Valve modulating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London. -(Assignees of Pray, G. E. ; Wading River, Long Island, New York, U.S.A.) Nov. 14, 1931, No. 31585. Convention date, Nov. 19, 1930. [Class 40 (v).] In a radio or other high-frequency transmitter improved circuit arrangements are employed to enable the keying to give comparatively gradual changes in the high-frequency amplitude, with the object of reducing key-click interference at adjacent receiving stations. As shown in Fig. 1, the key or relay K is arranged to apply either positive or negative voltage to the grid 11 of the keying-valve 9, the plate of which is connected to the screen-grid of the high-frequency valve 1. The screen-grid is given a positive voltage by connection to the HT supply B through a resistance R2 which is also in the plate supply circuit of the keying- valve 9. The keying changes are rendered gradual by the provision of a resistance R1 and condenser C1 in the grid circuit of the valve 9, and also by the resistance R2 and condenser C2 in its plate circuit. The resistance R may be in the plate circuit of the valve 1 instead of the screen-grid circuit. As shown in Fig. 3, the keying-valve 9 is in the grid direct-current circuit of the valve 1, and is shunted by a condenser C4. Positive and negative bias voltages for the keying-valve 9 are supplied by tappings on a potentiometer R4 from which also plate voltage is supplied to the valve 9. Plate voltage for the main valve 1 may be supplied from a separate source HV, or from the same potentiometer. A condenser and resistance in series may be connected across a section of the potentiometer R4, and the key K may be arranged to short-circuit this section.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US496622A US1977596A (en) | 1930-11-19 | 1930-11-19 | Keying |
US722829A US2089811A (en) | 1930-11-19 | 1934-04-28 | Keying |
Publications (1)
Publication Number | Publication Date |
---|---|
GB376154A true GB376154A (en) | 1932-07-07 |
Family
ID=27052200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31585/31A Expired GB376154A (en) | 1930-11-19 | 1931-11-14 | Improvements in or relating to radio and other high frequency transmitters |
Country Status (2)
Country | Link |
---|---|
US (1) | US2089811A (en) |
GB (1) | GB376154A (en) |
-
1931
- 1931-11-14 GB GB31585/31A patent/GB376154A/en not_active Expired
-
1934
- 1934-04-28 US US722829A patent/US2089811A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US2089811A (en) | 1937-08-10 |
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