GB605353A - Improvements in or relating to tuning devices for superheterodyne receivers - Google Patents
Improvements in or relating to tuning devices for superheterodyne receiversInfo
- Publication number
- GB605353A GB605353A GB34501/45A GB3450145A GB605353A GB 605353 A GB605353 A GB 605353A GB 34501/45 A GB34501/45 A GB 34501/45A GB 3450145 A GB3450145 A GB 3450145A GB 605353 A GB605353 A GB 605353A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- oscillator
- cores
- coil
- coils
- 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
605,353. Inductances. PHILIPS LAMPS, Ltd. Dec. 20, 1945, No. 34501. Convention date, Dec. 5, 1940. [Class 38 (ii)] The desired frequency difference between the tuning of local oscillator and the preliminary circuits of a superheterodyne receiver is maintained throughout the range by making the oscillator coil and its core longer than the other coils and cores; the oscillator core is adjustable as to its initial position and still extends into its coil when the others are entirely withdrawn. As shown, coils 1 and 2 having cores 4 and 5 serve to tune two high-frequency circuits of a superheterodyne receiver while coil 3 with core 6 tunes the oscillator. The frequency difference between the oscillator circuit and the other circuits is mainly determined by the nature of the cores and the larger diameter of the oscillator coil 3. Tracking is further improved by making core 6 longer than the other cores, and arranging for core 6 to enter coil 3 before the other cores enter their coils. Core 6 is adjustably mounted on the common operating bar 7.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL605353X | 1940-12-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB605353A true GB605353A (en) | 1948-07-21 |
Family
ID=19787913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34501/45A Expired GB605353A (en) | 1940-12-05 | 1945-12-20 | Improvements in or relating to tuning devices for superheterodyne receivers |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2486152A (en) |
| DE (1) | DE971188C (en) |
| FR (1) | FR877453A (en) |
| GB (1) | GB605353A (en) |
| NL (1) | NL59335C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2921186A (en) * | 1954-06-10 | 1960-01-12 | Polarad Electronics Corp | Means for generating a voltage linearly proportional to frequency |
| US2882392A (en) * | 1955-03-09 | 1959-04-14 | Rca Corp | Receiver tuned by inductors with tracking by initial positionment of coils on cores |
| US3310526A (en) * | 1961-12-18 | 1967-03-21 | Gen Electric | Cyclopolysiloxanes |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2190082A (en) * | 1933-04-22 | 1940-02-13 | Johnson Lab Inc | Permeability-tuned superheterodyne receiver |
| US2037754A (en) * | 1933-12-29 | 1936-04-21 | Rca Corp | Superheterodyne receiver |
| US2276699A (en) * | 1939-03-11 | 1942-03-17 | Telefunken Geselischaft Fur Dr | Superheterodyne receiver |
| US2263613A (en) * | 1939-03-31 | 1941-11-25 | Rca Corp | Unicontrol variable inductance tuning system |
| US2190048A (en) * | 1939-04-10 | 1940-02-13 | Johnson Lab Inc | Permeability-tuned oscillator tracking arrangement |
| NL58891C (en) * | 1940-01-02 | |||
| NL61935C (en) * | 1940-05-17 |
-
0
- NL NL59335D patent/NL59335C/xx active
-
1941
- 1941-12-03 DE DEN2326D patent/DE971188C/en not_active Expired
- 1941-12-04 FR FR877453D patent/FR877453A/en not_active Expired
-
1945
- 1945-12-20 GB GB34501/45A patent/GB605353A/en not_active Expired
-
1946
- 1946-05-09 US US668534A patent/US2486152A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2486152A (en) | 1949-10-25 |
| NL59335C (en) | |
| DE971188C (en) | 1958-12-24 |
| FR877453A (en) | 1942-12-08 |
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