GB642344A - Improvements in or relating to radio receiving apparatus - Google Patents
Improvements in or relating to radio receiving apparatusInfo
- Publication number
- GB642344A GB642344A GB5971/48A GB597148A GB642344A GB 642344 A GB642344 A GB 642344A GB 5971/48 A GB5971/48 A GB 5971/48A GB 597148 A GB597148 A GB 597148A GB 642344 A GB642344 A GB 642344A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- frequency
- oscillator
- output
- signals
- 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
- 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
- H04B1/26—Circuits for superheterodyne receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
Abstract
642,344. Frequency measuring. DEPARTMENT OF COMMERCE, DIRECTOR OF THE OFFICE OF TECHNICAL SERVICES OF. Feb. 27, 1948, No. 5971. Convention date, Nov. 27, 1945. [Class 37] [Also in Group XL (c)] A radio receiver comprises a plurality of oscillator and amplifier sections so connected that one part of the output of each amplifier is directly amplified, and the remainder of the output is amplified after frequency conversion, by the next amplifier, each amplifier having a band width one half the width of its predecessor. The arrangement enables a narrow band amplifier to be used in a receiver which is responsive, without variation of tuning, to all signals in a wide frequency band. Fig. 1 shows part of a radio receiver in which all incoming signals in the frequency band of, for example, 100 mc/s. to 120 mc/s are mixed in frequency converter 11, with signals at 110 mc/s. from oscillator 12. The first amplifier 13 passes frequencies 'between 1 mc. and 10 mc/s. and therefor amplifies all beat frequencies corresponding to signals between 100 and 120 mc/s. except for a null between 109 and 111 mc/s. The output from the first amplifier is applied to a second amplifier 16 which passes frequencies between 6 mc/s. and 10 mc/s. The portion of the output from amplifier 13 between 6 and 10 mc/s, is amplified directly by amplifier 16, while that between 1 and 5 mc/s. is first converted by mixing with oscillations at 11 mc/s. from oscillator 15. The frequency of an incoming signal may be determined by varying the frequency of oscillator 12 until the signal disappears due to the presence of the null which exists around the particular frequency of the oscillator.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US642344XA | 1945-11-27 | 1945-11-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB642344A true GB642344A (en) | 1950-08-30 |
Family
ID=22054485
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5971/48A Expired GB642344A (en) | 1945-11-27 | 1948-02-27 | Improvements in or relating to radio receiving apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB642344A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2258359A (en) * | 1991-06-13 | 1993-02-03 | Hughes Aircraft Co | Multi-band digital receiver with bandwidth reduction |
-
1948
- 1948-02-27 GB GB5971/48A patent/GB642344A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2258359A (en) * | 1991-06-13 | 1993-02-03 | Hughes Aircraft Co | Multi-band digital receiver with bandwidth reduction |
GB2258359B (en) * | 1991-06-13 | 1996-02-14 | Hughes Aircraft Co | Multi-band digital receiving apparatus and method with bandwidth reduction |
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