GB645849A - Improvements in radio receiving apparatus - Google Patents
Improvements in radio receiving apparatusInfo
- Publication number
- GB645849A GB645849A GB2929647A GB2929647A GB645849A GB 645849 A GB645849 A GB 645849A GB 2929647 A GB2929647 A GB 2929647A GB 2929647 A GB2929647 A GB 2929647A GB 645849 A GB645849 A GB 645849A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- coil
- circuit
- provisional
- output
- 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
- H03F3/46—Reflex amplifiers
- H03F3/48—Reflex amplifiers with tubes only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuits Of Receivers In General (AREA)
- Superheterodyne Receivers (AREA)
Abstract
645,849. Superheterodyne circuits. BALHAM, H. Nov. 3, 1947, No. 29296. [Class 40 (v)] In a reflex superheterodyne receiver the reflex valve is of a high impedance type and amplifies the radio and intermediate frequencies or a first and a second intermediate frequency, the frequency-changing being effected by a twoterminal rectifier. In the circuit shown the received signal is applied to the control grid of the heptode section of valve V1 and the output is applied through a coil 3, a tuned circuit 4 and a coil 5 to the first diode of a valve 2 in series with the voltage induced in a coil 6 from a local oscillator comprising the triode section of valve V1. The resulting 160 kc/s. I.F. in coil 7 is filtered in tuned circuits 8 and 9 and passed back to the input grid of valve V1. Amplified I.F. is taken from coils 10 and 11 in the output circuit of valve V1 and detected in the second diode of valve V2. The resulting output is passed through a resistance capacitance filter R2, R3, C2, C3 back to the input grid of valve V1. The amplified audio voltage developed across resistor Rl in the anode circuit is fed to the grid of the output valve V2. The Provisional Specification includes in addition, the circuit diagrams of a permeability tuned receiver (Fig. 1, Provisional, not shown) and a capacitor tuned receiver (Fig. 2, Provisional, not shown) in which both sides of the capacitors are above ground potential. A double superheterodyne receiver is also illustrated (Fig. 3, Provisional, not shown), the R.F., two I.F. and audio signals all being amplified in the common valve but with the frequency changing diodes included in the same envelope as the second local oscillator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2929647A GB645849A (en) | 1947-11-03 | 1947-11-03 | Improvements in radio receiving apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2929647A GB645849A (en) | 1947-11-03 | 1947-11-03 | Improvements in radio receiving apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB645849A true GB645849A (en) | 1950-11-08 |
Family
ID=10289291
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2929647A Expired GB645849A (en) | 1947-11-03 | 1947-11-03 | Improvements in radio receiving apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB645849A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2714158A (en) * | 1950-08-10 | 1955-07-26 | Hartford Nat Bank & Trust Co | Radio receiver circuit with reflex means |
US2778932A (en) * | 1951-06-15 | 1957-01-22 | Admiral Corp | Reflex amplifier circuits |
US3054955A (en) * | 1959-06-10 | 1962-09-18 | Westinghouse Electric Corp | Reflex transistor amplifier |
-
1947
- 1947-11-03 GB GB2929647A patent/GB645849A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2714158A (en) * | 1950-08-10 | 1955-07-26 | Hartford Nat Bank & Trust Co | Radio receiver circuit with reflex means |
US2778932A (en) * | 1951-06-15 | 1957-01-22 | Admiral Corp | Reflex amplifier circuits |
US3054955A (en) * | 1959-06-10 | 1962-09-18 | Westinghouse Electric Corp | Reflex transistor amplifier |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB592415A (en) | Improvements in or relating to frequency discriminator circuits | |
GB536917A (en) | Improvements in or relating to modulated-carrier signal receivers of the homodyne type | |
US2491809A (en) | Radio receiver | |
GB645849A (en) | Improvements in radio receiving apparatus | |
US2022067A (en) | Feed-back circuits | |
US1917113A (en) | Superregenerative receiver | |
GB795561A (en) | Improvements in or relating to frequency demodulators | |
US2751493A (en) | Noise squelch system | |
GB467731A (en) | Improvements in and relating to wireless and like receivers | |
US2864002A (en) | Transistor detector | |
US2539818A (en) | Frequency modulation detector | |
US2921196A (en) | Transistor regenerative detector circuit | |
GB603367A (en) | Super-regenerative receiver | |
GB917819A (en) | Improvements in or relating to receiver circuit arrangements comprising a ratio detector | |
GB648920A (en) | Self-quench superregenerative wave-signal receiver | |
US2188964A (en) | Image-frequency suppression system | |
GB648622A (en) | Improvements in angle modulation detector circuits | |
US2517719A (en) | Frequency converter system | |
GB796082A (en) | Improved a.m. or f.m. radio receiver detector circuit | |
GB1095227A (en) | Improvements in input stages of radio receivers | |
US2313911A (en) | Selective system | |
GB629954A (en) | Improvements in circuit arrangements employing thermionic valves | |
US1905873A (en) | Detector circuit for three-element gaseous discharge tubes | |
GB470372A (en) | Improvements in or relating to radio and like receivers | |
GB230097A (en) | Improvements in or relating to wireless receiving apparatus |