GB413443A - Improvements in or relating to muting devices for radio receivers - Google Patents
Improvements in or relating to muting devices for radio receiversInfo
- Publication number
- GB413443A GB413443A GB935133A GB935133A GB413443A GB 413443 A GB413443 A GB 413443A GB 935133 A GB935133 A GB 935133A GB 935133 A GB935133 A GB 935133A GB 413443 A GB413443 A GB 413443A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- triode
- diode
- valve
- circuit
- 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
- 230000000903 blocking effect Effects 0.000 abstract 4
- 230000003321 amplification Effects 0.000 abstract 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 2
- 230000003111 delayed effect Effects 0.000 abstract 1
- 238000010079 rubber tapping Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
- H03G3/26—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
413,443. Valve circuits for wireless reception. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and SMYTH, C. N., c/o General Electric Co., Ltd., Wembley, Middlesex. March 28, 1933, No. 9351. [Class 40 (v).] When signals below a predetermined threshold value are being received a blocking bias is applied to the signal rectifier and to the grid of a valve amplifying the D.C. gain control potentials. As shown, the signal rectifier is one of the diodes 4, 3 of a double-diode triode valve 5, with a load resistance 6, the D.C. and A.C. potentials across which are applied separately to the triode grid. The low frequency output from valve 5 is taken from the transformer 7 associated with its plate circuit. Potentials for the automatic gain control of other valves in the circuit are taken from a lead 8 being derived after D.C. amplification in the triode 5 from the cathode resistance 25. The control is applied through and delayed by the diode 9, 3 the anode of which is biassed through resistance 28 from the portion 21 of a potentiometer 19-24. The muting valve 13 is a double diode triode the two diode anodes being connected together and fed from a tuned circuit 10. The load resistance 14 of this diode circuit is also in the triode grid circuit 16 together with an adjustable biassing voltage taken through the leads 15 from a tapping on the main supply potentiometer, while the triode plate circuit 17 includes the resistance 6. When signals below a predetermined intensity are being received, the valve 13 passes a large plate current through the resistance 6, thus blocking the signal diode 4, 3 and the grid of the triode 5. When the signal increases, the voltage across the resistance 14 increases, blocking the grid 16 and removing the blocking potential across resistance 6, which further results in increased amplification of the controlled stages and thus increases the rapidity of the change from the inoperative to the operative state and vice versa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB935133A GB413443A (en) | 1933-03-28 | 1933-03-28 | Improvements in or relating to muting devices for radio receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB935133A GB413443A (en) | 1933-03-28 | 1933-03-28 | Improvements in or relating to muting devices for radio receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB413443A true GB413443A (en) | 1934-07-19 |
Family
ID=9870257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB935133A Expired GB413443A (en) | 1933-03-28 | 1933-03-28 | Improvements in or relating to muting devices for radio receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB413443A (en) |
-
1933
- 1933-03-28 GB GB935133A patent/GB413443A/en not_active Expired
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