GB279808A - Improvements in or relating to radio receiving devices - Google Patents
Improvements in or relating to radio receiving devicesInfo
- Publication number
- GB279808A GB279808A GB25772/27A GB2577227A GB279808A GB 279808 A GB279808 A GB 279808A GB 25772/27 A GB25772/27 A GB 25772/27A GB 2577227 A GB2577227 A GB 2577227A GB 279808 A GB279808 A GB 279808A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- signals
- heterodyne
- low
- frequencies
- 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
- 230000010355 oscillation Effects 0.000 abstract 2
- 230000003321 amplification Effects 0.000 abstract 1
- 230000035559 beat frequency Effects 0.000 abstract 1
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/18—Modifications of frequency-changers for eliminating image frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Superheterodyne Receivers (AREA)
Abstract
279,808. Marconi's Wireless Telegraph Co., Ltd., (Assignees of Roberts, W. van B.). Oct. 26, 1926, [Convention date]. Thermionic heterodyne receivers.-Undesired " image " signals in supersonic reception are eliminated by making the frequency difference between a given local oscillation and the desired signals sufficiently larger to throw the range of " image " frequencies well outside the normal range of broadcast frequencies. Preferably the beat frequency should be not less than, nor more than, twice the frequency of any desired signal. In order to increase the number of signal-frequencies coming within the tuning-range of the set, a second fixed-frequency heterodyne is introduced more closely related to the first beat note than the latter is to the desired signal. The system enables low-pass filter couplings to be used in place of an undesirably large number of selective circuits tuned to the desired signals. As shown in Fig 3, signals from a. loop aerial 11 are fed through a low-pass filter 12 to a detector valve 13, where they are combined with oscillations from a circuit 14 to form the primary beat note. After amplification at 15, a second heterodyne is introduced at 17 on the grid of the detector valve 16. The output is passed through an intermediate-frequency band filter 18, is amplified at 19, rectified at 20, and finally amplified in low-frequency form by the valve 21.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US144244A US1871740A (en) | 1926-10-26 | 1926-10-26 | Method of receiving radio signals and apparatus therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB279808A true GB279808A (en) | 1928-02-09 |
Family
ID=22507718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25772/27A Expired GB279808A (en) | 1926-10-26 | 1927-09-29 | Improvements in or relating to radio receiving devices |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1871740A (en) |
| GB (1) | GB279808A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE751089C (en) * | 1935-10-31 | 1952-11-24 | Georg Von Schaub | Overlay receiver with a high intermediate frequency and an overlaying overlay fundamental frequency |
| DE966780C (en) * | 1952-02-03 | 1957-09-05 | Telefunken Gmbh | Circuit arrangement for short-wave reception with a superimposition receiver which is set up at least for medium-wave, short-wave and ultra-short-wave reception |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2554515A (en) * | 1938-08-06 | 1951-05-29 | Leo C Young | Radio ranging system |
-
1926
- 1926-10-26 US US144244A patent/US1871740A/en not_active Expired - Lifetime
-
1927
- 1927-09-29 GB GB25772/27A patent/GB279808A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE751089C (en) * | 1935-10-31 | 1952-11-24 | Georg Von Schaub | Overlay receiver with a high intermediate frequency and an overlaying overlay fundamental frequency |
| DE966780C (en) * | 1952-02-03 | 1957-09-05 | Telefunken Gmbh | Circuit arrangement for short-wave reception with a superimposition receiver which is set up at least for medium-wave, short-wave and ultra-short-wave reception |
Also Published As
| Publication number | Publication date |
|---|---|
| US1871740A (en) | 1932-08-16 |
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