GB372692A - Improvements in or relating to heterodyne receivers, suitable for use for wireless and other high frequency reception - Google Patents
Improvements in or relating to heterodyne receivers, suitable for use for wireless and other high frequency receptionInfo
- Publication number
- GB372692A GB372692A GB30120/31A GB3012031A GB372692A GB 372692 A GB372692 A GB 372692A GB 30120/31 A GB30120/31 A GB 30120/31A GB 3012031 A GB3012031 A GB 3012031A GB 372692 A GB372692 A GB 372692A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oscillator
- frequency
- produced
- beat
- tuned
- 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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range
Abstract
372,692. Valve amplifying and detecting circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London.-(Assignees of Roberts, W. van B., 155, Hodge Road, Princeton, New Jersey, U.S.A.) Oct. 30, 1931, No. 30120. Convention date, Oct. 30, 1930. [Class 40 (v).] To facilitate the ganging of the tuning of a supersonic heterodyne receiver the oscillator 5 is tuned to the signal and the required difference frequency is produced by an auxiliary oscillator 6 tuned to the intermediate frequency, and only one of the side frequencies produced by modulation is used to beat with the signal frequency. The auxiliary modulating oscillator 6 is connected in parallel to the oscillator 5 through a choke 16 and a filter F is interposed in the coupling C of the detector 2 to the oscillators to suppress one of the beat frequencies produced. The Specification as open to inspection under Sect. 91 (3) (a) comprises also an arrangement in which the filter F is omitted, in which case the two oscillator voltages applied produce two beat frequencies which, if unequal, give audible beats in the final detector so that for receiving telegraphy a second heterodyne is unnecessary. For telephony the oscillator 5 must be maintained exactly synchronous with the carrier frequency with thi.s modification. This subjectmatter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US492116A US1969903A (en) | 1930-10-30 | 1930-10-30 | Superheterodyne receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB372692A true GB372692A (en) | 1932-05-12 |
Family
ID=23955005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30120/31A Expired GB372692A (en) | 1930-10-30 | 1931-10-30 | Improvements in or relating to heterodyne receivers, suitable for use for wireless and other high frequency reception |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1969903A (en) |
| GB (1) | GB372692A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2428265A (en) * | 1943-06-04 | 1947-09-30 | Rca Corp | Frequency modulation receiving system |
| US2656459A (en) * | 1945-10-30 | 1953-10-20 | John H Tinlot | Wide frequency coverage beacon receiver |
-
1930
- 1930-10-30 US US492116A patent/US1969903A/en not_active Expired - Lifetime
-
1931
- 1931-10-30 GB GB30120/31A patent/GB372692A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1969903A (en) | 1934-08-14 |
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