GB404349A - Improvements in or relating to frequency selective circuit arrangements for use in radio reception - Google Patents
Improvements in or relating to frequency selective circuit arrangements for use in radio receptionInfo
- Publication number
- GB404349A GB404349A GB19968/32A GB1996832A GB404349A GB 404349 A GB404349 A GB 404349A GB 19968/32 A GB19968/32 A GB 19968/32A GB 1996832 A GB1996832 A GB 1996832A GB 404349 A GB404349 A GB 404349A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuits
- shows
- prov
- cascade
- complex
- 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
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 238000010079 rubber tapping Methods 0.000 abstract 2
- 238000013016 damping Methods 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
Classifications
-
- 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
- H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0153—Electrical filters; Controlling thereof
- H03H7/0161—Bandpass filters
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Amplifiers (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
404,349. Impedance networks; valve circuits for wireless reception. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London, and RUST, N. M., 109, London Road, Chelinsford. July 14, 1932, Nos. 19968 and 29752. [Classes 40 (iii) and 40 (v).] In a band-pass circuit of the fixed tuned or variably tunable type one or more branched circuits are provided, each branch comprising inductance in series with capacity and being associated with negative resistance means to reduce the effective damping. In an alternative arrangement complex resonant circuits in cascade are employed. Fig. 4 (Prov. 19968 /32) shows a pair of branched circuits L1 C1, L2 C2 with associated negative resistance devices consisting of dynatron connected screen-grid valves VI. Such a branch circuit may be connected in parallel with a tuned input or intervalve circuit matching being effected by a tapping to the inductance or between two series condensers. Fig. 4 (Prov. 29752/32) shows a cascade arrangement of complex circuits A, B, coupled by an amplifying valve V3, and each associated with dynatron connected screen-grid valves V1, V2. These circuits are ganged to have a constant frequency separation and each gives a sharp cut-off on one side of the resonant frequency the overall response being shown in Fig. 3 (Prov. 29752/32). Fig. 6 shows a superheterodyne receiver in which the coupling 1b, 2b, 3b is arranged between the first detector 10 and the intermediate frequency amplifier 12. The auxiliary condensers k1, k2 are mechanically coupled so that one is maximum when the other is minimum and serve to vary the band width. Second channel interference can be removed by the use of a coupling in which the minimum response is removed from the resonance frequency by twice the intermediate frequency used. Fig. 7 shows complex cascade connected circuits A, B, tapped across part of the tuned circuits 1b and by adjustment of the tapping the isolating valve V3 may be dispensed with.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB19968/32A GB404349A (en) | 1932-07-14 | 1932-07-14 | Improvements in or relating to frequency selective circuit arrangements for use in radio reception |
| US677617A US2071902A (en) | 1932-07-14 | 1933-06-26 | Tunable selector circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB19968/32A GB404349A (en) | 1932-07-14 | 1932-07-14 | Improvements in or relating to frequency selective circuit arrangements for use in radio reception |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB404349A true GB404349A (en) | 1934-01-15 |
Family
ID=10138107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19968/32A Expired GB404349A (en) | 1932-07-14 | 1932-07-14 | Improvements in or relating to frequency selective circuit arrangements for use in radio reception |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2071902A (en) |
| GB (1) | GB404349A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2688086A (en) * | 1948-07-10 | 1954-08-31 | Motorola Inc | Television tuner |
| US4399561A (en) * | 1980-12-29 | 1983-08-16 | Motorola, Inc. | Variable capacitance circuit |
-
1932
- 1932-07-14 GB GB19968/32A patent/GB404349A/en not_active Expired
-
1933
- 1933-06-26 US US677617A patent/US2071902A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2071902A (en) | 1937-02-23 |
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