GB653031A - Improvements in or relating to radio receiving sets tunable to a plurality of wavelength ranges - Google Patents
Improvements in or relating to radio receiving sets tunable to a plurality of wavelength rangesInfo
- Publication number
- GB653031A GB653031A GB15759/48A GB1575948A GB653031A GB 653031 A GB653031 A GB 653031A GB 15759/48 A GB15759/48 A GB 15759/48A GB 1575948 A GB1575948 A GB 1575948A GB 653031 A GB653031 A GB 653031A
- Authority
- GB
- United Kingdom
- Prior art keywords
- condenser
- circuit
- series
- capacity
- fixed
- 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
- H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
653,031. Radio receiving circuits. PHILIPS ELECTRICAL, Ltd. June 11; 1948, No. 15759. Convention date, June 14, 1947. [Class 40 (v)] In a radio receiver tunable to a plurality of wave ranges by means of resonant circuits comprising a fixed inductance in parallel with a common variable condenser, each parallel tuned circuit is provided with a switch for connecting a fixed or pre-set condenser, which has a much smaller capacity than the maximum capacity of the variable condenser, in series with the inductance of the circuit in such manner that the total minimum capacity of the circuit is reduced and the receiver is adapted for the reception of higher frequencies. As shown, the effect of the stray capacity CO is reduced by means of condenser C1 connected in series with the coil L and a fixed or pre-set condenser C2 may also be switched in series with the tuning condenser C so that the variation with tuning of the signal voltage applied to the input of the valve is considerably reduced. Fig. 1 (not shown) shows the highfrequency and mixing stages of a superheterodyne receiver using the circuit of Fig. 2, in which switching in the additional condensers C1, C2 changes the wave range from 6 to 18 mc/s. to 18 to 23 mc/s.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL653031X | 1947-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB653031A true GB653031A (en) | 1951-05-09 |
Family
ID=19795139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15759/48A Expired GB653031A (en) | 1947-06-14 | 1948-06-11 | Improvements in or relating to radio receiving sets tunable to a plurality of wavelength ranges |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE483111A (en) |
| DE (1) | DE855419C (en) |
| FR (1) | FR967551A (en) |
| GB (1) | GB653031A (en) |
| NL (1) | NL73503C (en) |
-
0
- NL NL73503D patent/NL73503C/xx active
- BE BE483111D patent/BE483111A/xx unknown
-
1948
- 1948-06-11 GB GB15759/48A patent/GB653031A/en not_active Expired
- 1948-06-11 FR FR967551D patent/FR967551A/en not_active Expired
- 1948-12-23 DE DEP26165A patent/DE855419C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR967551A (en) | 1950-11-07 |
| DE855419C (en) | 1952-11-13 |
| BE483111A (en) | |
| NL73503C (en) |
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