GB493757A - Improvements in superheterodyne receivers for short-wave reception - Google Patents
Improvements in superheterodyne receivers for short-wave receptionInfo
- Publication number
- GB493757A GB493757A GB17413/38A GB1741338A GB493757A GB 493757 A GB493757 A GB 493757A GB 17413/38 A GB17413/38 A GB 17413/38A GB 1741338 A GB1741338 A GB 1741338A GB 493757 A GB493757 A GB 493757A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- condenser
- reception
- grids
- wave
- 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
- 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
- H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
- H03D7/10—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between different pairs of electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
Abstract
493,757. Superheterodyne circuits for wireless reception. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. June 11, 1938, No. 17413. Convention date, June 14, 1937. [Class 40 (v)] In a superheterodyne receiver for shortwave reception comprising a mixing valve having an input control grid 13, an oscillator control grid 30 between the input control grid and the cathode, and a positively-biassed grid 33 between the two control grids, the occurrence of oscillations of local-oscillator frequency at the input control grid is prevented or minimized by a series or parallel connection of resistance and capacity between the two control grids. In the arrangement shown, which provides wave-band switching for alternate reception on long and short waves and has a separate local oscillator 16, a resistance 38 and condenser 37 are connected in parallel between grids 13, 30. Since for long waves the condenser 37 alone is sufficient and the resistance 38 would act as a substantial shortcircuit to the condenser, the resistance is cut out during long-wave reception by a switch 39 coupled to the wave-band switches. Another arrangement, Fig. 2 (not shown), comprises an octode embodying the local oscillator and a series connection of a resistance and condenser across the two control grids.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE207280X | 1937-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB493757A true GB493757A (en) | 1938-10-13 |
Family
ID=5793634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17413/38A Expired GB493757A (en) | 1937-06-14 | 1938-06-11 | Improvements in superheterodyne receivers for short-wave reception |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE428571A (en) |
| CH (1) | CH207280A (en) |
| FR (1) | FR839258A (en) |
| GB (1) | GB493757A (en) |
| NL (1) | NL51350C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2784308A (en) * | 1951-10-13 | 1957-03-05 | Hartford Nat Bank & Trust Co | Two band converter stage with signal grid bias stabilizing means |
-
0
- NL NL51350D patent/NL51350C/xx active
- BE BE428571D patent/BE428571A/xx unknown
-
1938
- 1938-06-11 GB GB17413/38A patent/GB493757A/en not_active Expired
- 1938-06-13 CH CH207280D patent/CH207280A/en unknown
- 1938-06-14 FR FR839258D patent/FR839258A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2784308A (en) * | 1951-10-13 | 1957-03-05 | Hartford Nat Bank & Trust Co | Two band converter stage with signal grid bias stabilizing means |
Also Published As
| Publication number | Publication date |
|---|---|
| CH207280A (en) | 1939-10-15 |
| FR839258A (en) | 1939-03-30 |
| NL51350C (en) | |
| BE428571A (en) |
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