GB282445A - Radio signalling system - Google Patents
Radio signalling systemInfo
- Publication number
- GB282445A GB282445A GB34274/27A GB3427427A GB282445A GB 282445 A GB282445 A GB 282445A GB 34274/27 A GB34274/27 A GB 34274/27A GB 3427427 A GB3427427 A GB 3427427A GB 282445 A GB282445 A GB 282445A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- crystal
- circuit
- tuned
- coupled
- 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)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
282,445. Loewe, S. Dec. 18, 1926, [Convention date]. Thermionic heterodyne receivers.-The higher of the two frequencies resulting from the combination of a received wave and a locally-generated wave is fed to an amplifier through a piezoelectric crystal. The sum frequency is preferred to the difference frequency, as the sharp selection afforded by the crystal is then less detrimental to the quality of the reception. As shown, a tuned loop aerial 1 is connected to the grid circuit of a valve 3, and the local oscillator 4 is .coupled to its plate circuit, which also includes a circuit 5 tuned to the sum frequency. This frequency is selectively transmitted to resistancecoupled amplifiers 7, 8 by the piezo-electric crystal 6. Resistance-coupled radio-frequency, resultant-frequency and audio-frequency stages may be used, preferably in the form of multiplestage valves.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE282445X | 1926-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB282445A true GB282445A (en) | 1928-05-31 |
Family
ID=6040969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34274/27A Expired GB282445A (en) | 1926-12-18 | 1927-12-19 | Radio signalling system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB282445A (en) |
-
1927
- 1927-12-19 GB GB34274/27A patent/GB282445A/en not_active Expired
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