GB780811A - Improvements in or relating to travelling wave tube arrangements - Google Patents
Improvements in or relating to travelling wave tube arrangementsInfo
- Publication number
- GB780811A GB780811A GB3339454A GB3339454A GB780811A GB 780811 A GB780811 A GB 780811A GB 3339454 A GB3339454 A GB 3339454A GB 3339454 A GB3339454 A GB 3339454A GB 780811 A GB780811 A GB 780811A
- Authority
- GB
- United Kingdom
- Prior art keywords
- noise
- output
- helix
- amplitude
- phase
- 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
Abstract
780,811. Travelling-wave tubes. ENGLISH ELECTRIC VALVE CO., Ltd. July 25, 1955 [Nov. 18, 1954], No. 33394/54. Class 39(1). In a travelling wave tube there is interposed between the gun 2, 3 and wave retarding, helix 7 means such as a cavity resonator 13 or prehelix at a point of maximum noise current to extract velocity and convection current noise and to feed it via suitable amplitude and phase adjusting means 17 to give it equal amplitude and opposite phase to the noise signals in the output of the helix so that when mixed therewith noise can be eliminated from the output over a limited range of frequencies. In the form shown the gun 2, 3 is followed by a " drift tube " 4, noise extracting cavity resonator 13 disposed at a noise current maximum, velocity jump electrodes 5, 6 and helix 7 having input and output waveguides 11, 12. The extracted noise is fed to the output by coaxial line 14 and waveguide section 16, a delay line such as a length of cable and suitable phase and amplitude adjusting means (all represented by 17) being provided to give the extracted noise signal the right amplitude and phase for mixing with the main output signal. Waveguide 16 forms part of or is associated with output waveguide 12. The extracted noise signal and main amplified signal can be mixed without change of frequency or their frequencies can first be shifted by a common local oscillator and the resulting intermediate frequencies then mixed. The conditions are so adjusted that there is substantially no feedback of energy along line 14 and it is stated that the tendency to self oscillation can be further reduced by making the helix dispersive. If the cavity 13 is not quite in the best position to pick up noise, the potentials of the velocity jump electrodes and drift tube can be adjusted to improve noise pick up. The invention may be combined with known travelling wave tubes in which the helix starts at a noise current minimum to minimise noise in the output or if this condition is not fulfilled the voltage of a drift tube preceding the helix can be adjusted to minimize noise in the output.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3339454A GB780811A (en) | 1954-11-18 | 1954-11-18 | Improvements in or relating to travelling wave tube arrangements |
FR1133265D FR1133265A (en) | 1954-11-18 | 1955-10-25 | Developments to traveling wave tubes and other electron beam tubes |
DEE11547A DE1114943B (en) | 1954-11-18 | 1955-11-15 | Low-noise arrangement with a transit time tube, especially traveling wave tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3339454A GB780811A (en) | 1954-11-18 | 1954-11-18 | Improvements in or relating to travelling wave tube arrangements |
Publications (1)
Publication Number | Publication Date |
---|---|
GB780811A true GB780811A (en) | 1957-08-07 |
Family
ID=10352364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3339454A Expired GB780811A (en) | 1954-11-18 | 1954-11-18 | Improvements in or relating to travelling wave tube arrangements |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE1114943B (en) |
FR (1) | FR1133265A (en) |
GB (1) | GB780811A (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL167562B (en) * | 1951-04-11 | Honeywell Inc | SYSTEM FOR THE UNDERWATER TRANSFER OF INFORMATION. |
-
1954
- 1954-11-18 GB GB3339454A patent/GB780811A/en not_active Expired
-
1955
- 1955-10-25 FR FR1133265D patent/FR1133265A/en not_active Expired
- 1955-11-15 DE DEE11547A patent/DE1114943B/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE1114943B (en) | 1961-10-12 |
FR1133265A (en) | 1957-03-25 |
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