GB450057A - Television radio transmitter - Google Patents
Television radio transmitterInfo
- Publication number
- GB450057A GB450057A GB21922/35A GB2192235A GB450057A GB 450057 A GB450057 A GB 450057A GB 21922/35 A GB21922/35 A GB 21922/35A GB 2192235 A GB2192235 A GB 2192235A GB 450057 A GB450057 A GB 450057A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- carrier
- condenser
- grids
- frequency
- 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
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
- H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
- H03C1/24—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to different grid
Landscapes
- Picture Signal Circuits (AREA)
Abstract
450,057. Valve modulating circuits; thermionic valves. RADIOAKT.-GES. D. S. LOEWE, 10, Wiesenweg, Steglitz, Berlin. Aug. 2, 1935, No. 21922. Convention date, Aug. 9, 1934. [Classes 39 (i) and 40 (v)] In a modulating system for impressing television signals on a carrier wave, the signals and the carrier input are applied to separate grids of the modulating valve, the output circuit of which is tuned to an harmonic of the input carrier wave. As shown in Fig. 3, the carrier source 3 is coupled to the circuit of a grid 16b, and the picture signals are applied through a choke 5 and condenser 4 to the grid 16a. The grid 16a is biassed, to preclude grid current, through a leak resistance 6 shunted by a condenser 18 which has high reactance at the picture frequency, but low resistance at the radio frequency. The grid 16b has a fixed bias which may permit grid current but is such that only positive peaks of grid potential affect the anode current, thereby enabling the anode circuit 10 to be tuned to a multiple of the frequency of the source 3. The coupling afforded by the inherent capacity 17 between the grids does not induce any substantial oscillatory voltage on the grid 16a, on account of the low reactance of the condenser 18 at the carrier frequency. In a modification shown in Fig. 3a, the grid circuits are electrostatically isolated from each other by a balancing arrangement comprising a coil 2a coupled to the coil 2 and connected to the grid 16a by a condenser 19 of about equal capacity to the inherent capacity 17. The two grids may be of the same diameter and intermeshed, or one may be of larger diameter than the other with a screen interposed. In a further modification, the carrier is applied in push-pull to the symmetrical grids 16a, 16b, the picture signals are applied to a further negative grid, and a positive screen is interposed. Specification 435,561 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE450057X | 1934-08-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB450057A true GB450057A (en) | 1936-07-09 |
Family
ID=6538351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21922/35A Expired GB450057A (en) | 1934-08-09 | 1935-08-02 | Television radio transmitter |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE410599A (en) |
FR (1) | FR793162A (en) |
GB (1) | GB450057A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE489276A (en) * | 1948-06-10 | |||
NO20041471A (en) * | 2004-04-07 | 2005-08-15 | Ide Til Produkt As | Method and device for collecting liquid waste on a water surface. |
-
0
- BE BE410599D patent/BE410599A/xx unknown
-
1935
- 1935-07-30 FR FR793162D patent/FR793162A/en not_active Expired
- 1935-08-02 GB GB21922/35A patent/GB450057A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE410599A (en) | |
FR793162A (en) | 1936-01-18 |
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