GB513449A - Improvements in or relating to frequency control systems in high frequency electric circuits - Google Patents
Improvements in or relating to frequency control systems in high frequency electric circuitsInfo
- Publication number
- GB513449A GB513449A GB11028/38A GB1102838A GB513449A GB 513449 A GB513449 A GB 513449A GB 11028/38 A GB11028/38 A GB 11028/38A GB 1102838 A GB1102838 A GB 1102838A GB 513449 A GB513449 A GB 513449A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- circuit
- series
- frequency
- reactance
- 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
- 230000001939 inductive effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/042—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant with reactance tube
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
513,449. Automatic frequency control systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. April 11, 1938, No. 11028. Convention date, April 10, 1937. [Class 38 (iv)] [Also in Group XL] In order that the control action of a frequency control valve of the thermionic reactance type shall be substantially constant over the tuning range, the valve is connected across the controlled circuit through a series reactance of opposite sign to that simulated by the valve. The control valve 13 the gain of which is varied in dependence on departure of the I.F. impressed on amplifier 5 from its correct value simulates an inductive reactance across the tank circuit 4, 6 of the local oscillator 4. In series with this simulated inductance a condenser C3 is provided of such value that the series circuit is resonant at a frequency below the frequency range of the oscillator circuit 4, 6. The variation in effectiveness of control over the entire range is thus considerably reduced. Specifications 471,738, [Group XL], and 489.094 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US136064A US2128997A (en) | 1937-04-10 | 1937-04-10 | Automatic frequency control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB513449A true GB513449A (en) | 1939-10-12 |
Family
ID=22471111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11028/38A Expired GB513449A (en) | 1937-04-10 | 1938-04-11 | Improvements in or relating to frequency control systems in high frequency electric circuits |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2128997A (en) |
| CH (1) | CH202675A (en) |
| DE (1) | DE685736C (en) |
| GB (1) | GB513449A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE936153C (en) * | 1943-05-06 | 1955-12-07 | Philips Nv | Circuit for influencing the natural frequency of an oscillating circuit |
-
1937
- 1937-04-10 US US136064A patent/US2128997A/en not_active Expired - Lifetime
-
1938
- 1938-04-08 CH CH202675D patent/CH202675A/en unknown
- 1938-04-11 GB GB11028/38A patent/GB513449A/en not_active Expired
- 1938-04-12 DE DER102073D patent/DE685736C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE936153C (en) * | 1943-05-06 | 1955-12-07 | Philips Nv | Circuit for influencing the natural frequency of an oscillating circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CH202675A (en) | 1939-01-31 |
| US2128997A (en) | 1938-09-06 |
| DE685736C (en) | 1939-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB445558A (en) | Improvements in or relating to thermionic valve circuit arrangements | |
| GB483744A (en) | Improvements in or relating to thermionic valve amplifying circuits | |
| GB513449A (en) | Improvements in or relating to frequency control systems in high frequency electric circuits | |
| GB617647A (en) | Improvements in or relating to frequency-changing circuits | |
| GB564504A (en) | Improvements in and relating to electron discharge circuits | |
| GB516647A (en) | Improvements in or relating to automatic frequency control circuits for superheterodyne wireless receivers | |
| GB528632A (en) | Improvements in or relating to thermionic valve amplifiers | |
| GB465030A (en) | Improvements in thermionic amplifiers | |
| GB413973A (en) | Improvements in or relating to short wave thermionic valve transmitter arrangements | |
| GB541005A (en) | Television synchronizing and control system | |
| GB468756A (en) | Improvements in or relating to modulated carrier-wave transmitters | |
| GB424965A (en) | Improvements in and relating to radio receiving systems | |
| GB515546A (en) | Improvements in or relating to high frequency amplifier arrangements | |
| GB424470A (en) | Improvements in or relating to modulating and keying systems for radio and like transmitters | |
| GB491903A (en) | Improvements in or relating to circuit arrangements for suppressing undesired frequencies in wireless receiving apparatus | |
| GB413724A (en) | Improvements in or relating to superheterodyne wireless receiving sets | |
| GB466250A (en) | Improved coupling systems for high frequency electric circuits | |
| GB388732A (en) | Improvements in radio frequency receivers | |
| GB461983A (en) | Improvements in or relating to radio receivers | |
| GB361351A (en) | Improvements in thermionic valve circuits as applied to radiotelephonic systems and apparatus | |
| GB450057A (en) | Television radio transmitter | |
| GB341485A (en) | Improvements in or relating to wireless receivers | |
| GB367624A (en) | Improvements in or relating to talking-film installations | |
| GB227364A (en) | Improvements in receiving systems for wireless signals | |
| GB378733A (en) | High frequency signalling systems |