GB1029343A - Improvements in or relating to electric wave receivers - Google Patents
Improvements in or relating to electric wave receiversInfo
- Publication number
- GB1029343A GB1029343A GB3376464A GB3376464A GB1029343A GB 1029343 A GB1029343 A GB 1029343A GB 3376464 A GB3376464 A GB 3376464A GB 3376464 A GB3376464 A GB 3376464A GB 1029343 A GB1029343 A GB 1029343A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- circuit
- short
- diode
- arrangement
- 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
- 206010033799 Paralysis Diseases 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000009877 rendering 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
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3073—Circuits generating control signals when no carrier is present, or in SSB, CW or pulse receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
- H04B1/302—Circuits for homodyne or synchrodyne receivers for single sideband receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Burglar Alarm Systems (AREA)
- Circuits Of Receivers In General (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
1,029,343. Transistor automatic gain control circuits. COMMUNICATIONS PATENTS Ltd. Aug. 18, 1964, No. 33764/64. Heading H3T. In an automatic gain control arrangement the decay time of the control voltage is determined by two delay networks which provide respectively short and long decay times for short and long high-amplitude signals. The arrangement is more particularly intended for C.W. and single side-band telegraph signals and prevents paralysis by bursts of high-level noise. Transistor 1 comprises the last I.F. amplifier of a radio receiver and feeds a detector via the secondary of an I.F. transformer 2 having a tuned primary. It is also direct-coupled to an A.G.C. rectifier comprising transistor 4, the emitter of which is provided with a delay bias from potentiometer 5, 6. Unidirectional collector current pulses from this transistor charge up a long time constant circuit 7, 8 and also, via diode 9 a short time constant circuit 10, 11 from which the A.G.C. voltage is derived over a low output impedance amplifier 13, 14. The arrangement is such that a short high-amplitude signal, e.g. a noise burst, only charges up circuit 10, 11 which rapidly discharges over resistor 12, diode 9 rendering circuit 7, 8 inoperative; a longer signal, however, charges up this latter circuit, which then takes charge as soon as the potential across capacitor 11 falls sufficiently for diode G to become operative. The Specification also refers to the use of a third delay network of intermediate decay time.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3376464A GB1029343A (en) | 1964-08-18 | 1964-08-18 | Improvements in or relating to electric wave receivers |
| NO15927265A NO116042B (en) | 1964-08-18 | 1965-08-09 | |
| NL6510711A NL6510711A (en) | 1964-08-18 | 1965-08-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3376464A GB1029343A (en) | 1964-08-18 | 1964-08-18 | Improvements in or relating to electric wave receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1029343A true GB1029343A (en) | 1966-05-11 |
Family
ID=10357144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3376464A Expired GB1029343A (en) | 1964-08-18 | 1964-08-18 | Improvements in or relating to electric wave receivers |
Country Status (3)
| Country | Link |
|---|---|
| GB (1) | GB1029343A (en) |
| NL (1) | NL6510711A (en) |
| NO (1) | NO116042B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417016C (en) * | 2005-05-09 | 2008-09-03 | 华硕电脑股份有限公司 | Shock-wave noise preventing circuit |
-
1964
- 1964-08-18 GB GB3376464A patent/GB1029343A/en not_active Expired
-
1965
- 1965-08-09 NO NO15927265A patent/NO116042B/no unknown
- 1965-08-16 NL NL6510711A patent/NL6510711A/xx unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100417016C (en) * | 2005-05-09 | 2008-09-03 | 华硕电脑股份有限公司 | Shock-wave noise preventing circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| NO116042B (en) | 1969-01-20 |
| NL6510711A (en) | 1966-02-21 |
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