GB696058A - Improvements in electron discharge tubes - Google Patents
Improvements in electron discharge tubesInfo
- Publication number
- GB696058A GB696058A GB1876449A GB1876449A GB696058A GB 696058 A GB696058 A GB 696058A GB 1876449 A GB1876449 A GB 1876449A GB 1876449 A GB1876449 A GB 1876449A GB 696058 A GB696058 A GB 696058A
- Authority
- GB
- United Kingdom
- Prior art keywords
- helix
- auxiliary
- wave
- main
- helices
- 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
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/11—Means for reducing noise
Landscapes
- Microwave Tubes (AREA)
Abstract
696.058. Travelling-wave tubes. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Oct. 11, 1950 [July 15, 1949], No. 18764/49. Class 39(i) In a travelling wave amplifier there is interposed between the gun and main helix 8 an auxiliary helix 7 unconnected to any external source of waves, which has the same wave velocity as the main helix but a different D.C. potential or, as preferred, a different wave velocity as by making the pitch or diameter different but the same or nearly the same D.C. potential, so that the wave and beam velocities are unequal in the auxiliary helix; it is stated that random noise fluctuations in the beam induce a noise wave on the auxiliary helix which reacts back on the beam to induce a bunching modulation and that the voltage induced in the main helix 8 by random noise fluctuations and by the modulation component are out of phase and can be made to cancel. Exact cancellation can be achieved by varying the D.C. potential of the auxiliary helix 7 and the total beam current. The helices may be replaced by waveguides. Helix 7 is much shorter than helix 8 by a definite fraction in terms of wavelength. The molybdenum helices 7, 8 are supported by glass rods 10, and input and output guides 11, 12 associated with flanges 13 and chokes 14 are coupled to the ends of helix 8; a drift tube 15 connected to helix 7 is interposed between the two helices. The helix 8 may be copper plated to reduce losses, and the glass rods 10 may be coated with colloidal graphite at the vicinity of the centre portion of helix 8 to inhibit oscillation. The Provisional Specification states in addition that the voltage of the auxiliary helix may be less than that of the main helix for example 100 volts less. The auxiliary helix or guide may be replaced by a resonator detuned from the signal frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1876449A GB696058A (en) | 1949-07-15 | 1949-07-15 | Improvements in electron discharge tubes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1876449A GB696058A (en) | 1949-07-15 | 1949-07-15 | Improvements in electron discharge tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB696058A true GB696058A (en) | 1953-08-26 |
Family
ID=10117998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1876449A Expired GB696058A (en) | 1949-07-15 | 1949-07-15 | Improvements in electron discharge tubes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB696058A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2857547A (en) * | 1952-04-08 | 1958-10-21 | Int Standard Electric Corp | Traveling wave tube |
US2993139A (en) * | 1957-10-01 | 1961-07-18 | Gen Electric | Microwave modulator device |
US3092750A (en) * | 1959-10-22 | 1963-06-04 | Raytheon Co | Traveling wave tube |
US3401298A (en) * | 1964-07-30 | 1968-09-10 | Gen Electric Co Ltd | Noise reduction in a travelling wave tube employing a helix input coupler |
-
1949
- 1949-07-15 GB GB1876449A patent/GB696058A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2857547A (en) * | 1952-04-08 | 1958-10-21 | Int Standard Electric Corp | Traveling wave tube |
US2993139A (en) * | 1957-10-01 | 1961-07-18 | Gen Electric | Microwave modulator device |
US3092750A (en) * | 1959-10-22 | 1963-06-04 | Raytheon Co | Traveling wave tube |
US3401298A (en) * | 1964-07-30 | 1968-09-10 | Gen Electric Co Ltd | Noise reduction in a travelling wave tube employing a helix input coupler |
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