GB679176A - Improvements in or relating to discharge tubes for use in frequency-demodulation - Google Patents
Improvements in or relating to discharge tubes for use in frequency-demodulationInfo
- Publication number
- GB679176A GB679176A GB22915/48A GB2291548A GB679176A GB 679176 A GB679176 A GB 679176A GB 22915/48 A GB22915/48 A GB 22915/48A GB 2291548 A GB2291548 A GB 2291548A GB 679176 A GB679176 A GB 679176A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- cathode
- grids
- control
- coated
- 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
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/22—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
- H01J19/02—Electron-emitting electrodes; Cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J21/00—Vacuum tubes
- H01J21/02—Tubes with a single discharge path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2893/00—Discharge tubes and lamps
- H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Particle Accelerators (AREA)
- Microwave Tubes (AREA)
Abstract
679,176. Thermionic valves. PHILIPS ELECTRICAL, Ltd. Aug. 31, 1948 [Sept. 3, 1947], No. 22915/48. Class 39 (i). [Also in Group XL (c)] In a frequency modulation detector (see Group XL (c)) two voltages with a phase difference depending on the frequency deviation are applied to the two control grids of a valve with at least five grids. The mutual conductances of the grids are made lower than the saturated anode current in milliamps divided by four volts. A tubular cathode 18 is surrounded by an accelerator grid 19, first control grid 21, first screen grid 22, second control grid 23 and a second screen grid 25, all of elliptical crosssection, and a circular cylindrical anode 24. The pitch of the control grids 21, 23 is so arranged that at least two sections of the second control grid 23 of different pitch cooperate with a section of grid 21 of constant pitch. The tubular cathode is coated with electron emitter over a short length (1-10 mms.). The accelerator grid 19 and first screen grid 22 are connected to a positive voltage source of less than 40 volts. In order to reduce the current taken by the first grid, two rods, preferably connected to the cathode, may be provided between the cathode and the supports of the grid or the cathode may be coated only on the sides opposite the active part of the grid and the supports coated with insulating material on their inner sides.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL266765X | 1947-09-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB679176A true GB679176A (en) | 1952-09-17 |
Family
ID=19781765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB22915/48A Expired GB679176A (en) | 1947-09-03 | 1948-08-31 | Improvements in or relating to discharge tubes for use in frequency-demodulation |
Country Status (7)
Country | Link |
---|---|
US (1) | US2760067A (en) |
BE (1) | BE484647A (en) |
CH (1) | CH266765A (en) |
DE (1) | DE826760C (en) |
FR (1) | FR988495A (en) |
GB (1) | GB679176A (en) |
NL (1) | NL71107C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE969436C (en) * | 1951-04-26 | 1958-06-04 | Lorenz C Ag | Arrangement for demodulating frequency or phase modulated oscillations |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2086271A (en) * | 1934-07-04 | 1937-07-06 | Telefunken Gmbh | Electron discharge device |
NL45032C (en) * | 1934-12-27 | |||
NL46575C (en) * | 1935-01-31 | |||
US2090218A (en) * | 1935-06-25 | 1937-08-17 | Hygrade Sylvania Corp | Electron discharge device |
BE426298A (en) * | 1937-02-12 | |||
US2286337A (en) * | 1937-11-27 | 1942-06-16 | Telefunken Gmbh | Negative feedback circuit |
US2228980A (en) * | 1938-09-27 | 1941-01-14 | Telefunken Gmbh | Electron discharge device |
US2235498A (en) * | 1940-01-11 | 1941-03-18 | Rca Corp | Electron discharge device |
BE469561A (en) * | 1942-05-06 | |||
US2379764A (en) * | 1942-06-06 | 1945-07-03 | Rca Corp | Frequency modulation detection |
US2441254A (en) * | 1945-08-04 | 1948-05-11 | Remco Electronic Inc | Symmetrical space charge tube |
US2460062A (en) * | 1945-11-23 | 1949-01-25 | Philco Corp | Grid controlled electron tube |
-
0
- BE BE484647D patent/BE484647A/xx unknown
- NL NL71107D patent/NL71107C/xx active
-
1948
- 1948-08-31 GB GB22915/48A patent/GB679176A/en not_active Expired
- 1948-09-01 CH CH266765D patent/CH266765A/en unknown
- 1948-09-01 FR FR988495D patent/FR988495A/en not_active Expired
- 1948-12-24 DE DEP26500D patent/DE826760C/en not_active Expired
-
1951
- 1951-10-15 US US251351A patent/US2760067A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
BE484647A (en) | |
US2760067A (en) | 1956-08-21 |
FR988495A (en) | 1951-08-28 |
DE826760C (en) | 1952-01-03 |
CH266765A (en) | 1950-02-15 |
NL71107C (en) |
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