GB521983A - Improvements in tuning indicators in radio receiving sets - Google Patents
Improvements in tuning indicators in radio receiving setsInfo
- Publication number
- GB521983A GB521983A GB3488338A GB3488338A GB521983A GB 521983 A GB521983 A GB 521983A GB 3488338 A GB3488338 A GB 3488338A GB 3488338 A GB3488338 A GB 3488338A GB 521983 A GB521983 A GB 521983A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- screen
- tuning
- radio receiving
- ray tube
- 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
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
- H01J31/14—Magic-eye or analogous tuning indicators
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
521,983. Tuning indicators. M-O VALVE CO., Ltd., and COSGROVE, C. W. Nov. 30, 1938, No. 34883. [Classes 39 (i) and 40 (v)] A tuning indicator for a wireless receiver comprises two shadow electrodes 8, 9 intervening on different lines between the cathode 6 and a cylindrical screen 7 of a cathode ray tube, and means causing the electrodes to approach the potential of the screen at different rates as the receiver approaches tune. The electrodes 8, 9 are connected to the anode of a controlling triode 2, one directly and the other through a resistance 10 or battery whereby it is maintained more negative with respect to the screen. The electrodes of the triode and cathode ray tube may be enclosed in the same envelope, the two cathodes being combined, and the resistances 10, 4 may be arranged within the envelope or in its cap. Specification 506,390 is referred to.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL60869D NL60869C (en) | 1938-11-30 | ||
| GB3488338A GB521983A (en) | 1938-11-30 | 1938-11-30 | Improvements in tuning indicators in radio receiving sets |
| FR861713D FR861713A (en) | 1938-11-30 | 1939-11-16 | Tuning indicator for radio receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3488338A GB521983A (en) | 1938-11-30 | 1938-11-30 | Improvements in tuning indicators in radio receiving sets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB521983A true GB521983A (en) | 1940-06-05 |
Family
ID=10371084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3488338A Expired GB521983A (en) | 1938-11-30 | 1938-11-30 | Improvements in tuning indicators in radio receiving sets |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR861713A (en) |
| GB (1) | GB521983A (en) |
| NL (1) | NL60869C (en) |
-
0
- NL NL60869D patent/NL60869C/xx active
-
1938
- 1938-11-30 GB GB3488338A patent/GB521983A/en not_active Expired
-
1939
- 1939-11-16 FR FR861713D patent/FR861713A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR861713A (en) | 1941-02-15 |
| NL60869C (en) |
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