GB437643A - Improvements in detectors for television signals - Google Patents
Improvements in detectors for television signalsInfo
- Publication number
- GB437643A GB437643A GB6656/34A GB665634A GB437643A GB 437643 A GB437643 A GB 437643A GB 6656/34 A GB6656/34 A GB 6656/34A GB 665634 A GB665634 A GB 665634A GB 437643 A GB437643 A GB 437643A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- anode
- cathode
- circuit
- detector
- 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
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/22—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with tubes only
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
- H03D1/16—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
437,643. Valve detecting circuits. RADIOAKT.-GES. D. S. LOEWE, 10, Wiesenweg, Steglitz, Berlin. March 2, 1934, No. 6656. Convention date, March 2, 1933. [Class 40 (v)] The carrier frequency of television signals is neutralized in or after the detector 10. The detecting-valve has two control grids 11, 12 to which the signals are applied in opposite phase. In such a circuit the carrier frequency can be removed without affecting the highest image frequency even when the two frequencies are close. One control grid 11 is connected to the anode 17 of the final valve of an intermediate-frequency amplifier, the second control grid is earthed as regards alternating-current through a condenser 18, and the cathode 15 is connected to the mid-point 21 of two equal anode resistances 8, 9 in series. Alternatively a potentiometer is connected across the anode circuit and the cathode of the detector connected to the centre. A cathode-ray tube or other light relay may be connected directly to the rectifier. According to modifications : a separate valve is used for phase reversal, Fig. 3 (not shown) ; a detector with only one control grid is used, and a potentiometer in its anode circuit is so adjusted in a balanced circuit that no carrier frequency occurs at its output tapping, Fig. 4 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE437643X | 1933-03-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB437643A true GB437643A (en) | 1935-11-04 |
Family
ID=6507058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6656/34A Expired GB437643A (en) | 1933-03-02 | 1934-03-02 | Improvements in detectors for television signals |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR769520A (en) |
| GB (1) | GB437643A (en) |
| NL (1) | NL45389C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE740299C (en) * | 1938-04-01 | 1943-10-16 | Telefunken Gmbh | Amplifier for a wide frequency band |
-
0
- NL NL45389D patent/NL45389C/xx active
-
1934
- 1934-03-02 FR FR769520D patent/FR769520A/en not_active Expired
- 1934-03-02 GB GB6656/34A patent/GB437643A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE740299C (en) * | 1938-04-01 | 1943-10-16 | Telefunken Gmbh | Amplifier for a wide frequency band |
Also Published As
| Publication number | Publication date |
|---|---|
| NL45389C (en) | |
| FR769520A (en) | 1934-08-28 |
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