GB621267A - Improvements in or relating to wireless receivers with bandspreading - Google Patents
Improvements in or relating to wireless receivers with bandspreadingInfo
- Publication number
- GB621267A GB621267A GB4173/47A GB417347A GB621267A GB 621267 A GB621267 A GB 621267A GB 4173/47 A GB4173/47 A GB 4173/47A GB 417347 A GB417347 A GB 417347A GB 621267 A GB621267 A GB 621267A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tuning
- curve
- condenser
- variation
- band
- 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
- H03J3/02—Details
- H03J3/10—Circuit arrangements for fine tuning, e.g. bandspreading
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
Abstract
621,267. Radio receiving circuits. PHILIPS LAMPS, Ltd. Feb. 13, 1947, No. 4173. Convention date, March 11, 1944. [Class 40 (v)] One or more resonant circuits of a radio receiver are tuned in at least one short wave band with band-spreading, as shown by curve q, Fig. 2, as by using shaped condenser plates, and in one or more other ranges without band-spreading, by ganging a correcting reactance with the tuning condenser. The correcting reactance 3, Fig. 1, is inserted in circuit by the waveband switch 1, and is provided with a slidable core of ferromagnetic or conductive material. The variation in capacity obtained by shaping the condenser plates is shown in curve p. In the parts BD and EF, which correspond to the short wavebands to be spread, a slow variation of capacity is ensured. When tuning in the long and medium wave ranges, the inductance variation of the coil 3 is effected in such a manner that the divergences from constant slope in curve p are corrected over an adequately chosen part of the variation range, as shown by the dotted curve p, the part BE being used for tuning in the medium and long wave ranges. Alternatively the correcting reactance may be a condenser mounted on the same shaft as the tuning condenser.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL253604X | 1944-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB621267A true GB621267A (en) | 1949-04-06 |
Family
ID=19781213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4173/47A Expired GB621267A (en) | 1944-03-11 | 1947-02-13 | Improvements in or relating to wireless receivers with bandspreading |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2492519A (en) |
| BE (1) | BE463074A (en) |
| CH (1) | CH253604A (en) |
| FR (1) | FR926743A (en) |
| GB (1) | GB621267A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2129026A (en) * | 1933-03-09 | 1938-09-06 | Rca Corp | Tuning range adjustment device |
| GB552403A (en) * | 1941-10-03 | 1943-04-06 | Philips Nv | Improvements in or relating to means for tuning wireless sets |
| GB551064A (en) * | 1941-12-18 | 1943-02-05 | Philips Nv | Improvements in or relating to radio receivers |
-
0
- BE BE463074D patent/BE463074A/xx unknown
-
1946
- 1946-02-09 CH CH253604D patent/CH253604A/en unknown
- 1946-05-09 FR FR926743D patent/FR926743A/en not_active Expired
-
1947
- 1947-02-08 US US727347A patent/US2492519A/en not_active Expired - Lifetime
- 1947-02-13 GB GB4173/47A patent/GB621267A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH253604A (en) | 1948-03-15 |
| US2492519A (en) | 1949-12-27 |
| BE463074A (en) | |
| FR926743A (en) | 1947-10-09 |
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