GB720760A - Improvements in or relating to radio receiver circuits for at least two ultra high-frequency ranges - Google Patents
Improvements in or relating to radio receiver circuits for at least two ultra high-frequency rangesInfo
- Publication number
- GB720760A GB720760A GB5537/53A GB553753A GB720760A GB 720760 A GB720760 A GB 720760A GB 5537/53 A GB5537/53 A GB 5537/53A GB 553753 A GB553753 A GB 553753A GB 720760 A GB720760 A GB 720760A
- Authority
- GB
- United Kingdom
- Prior art keywords
- range
- frequency
- mixer
- crystal
- grounded
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Superheterodyne Receivers (AREA)
Abstract
720,760. Valve circuits for radio reception. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 27, 1953 [March 3, 1952], No. 5537/53. Class 40 (5). In a superheterodyne receiver operating on two ultra-high frequency ranges, the valve used for frequency-changing on the lower frequency range is switched to operate as an intermediate-frequency amplifier on the higherfrequency range, a crystal or diode mixer being used on this range. In one embodiment, Fig. 2, on the lower-frequency range signals from aerial 5 are amplified in a grounded-grid stage 16 and pass via coupled circuits 3, 4 to a triode mixer 8. Local oscillations from the oscillator 1 are also applied to the grid of the valve 8, the LF. output being taken from an anode coil 9 tuned by circuit capacity. On the higher frequency range, i.e. switch 17 moved to the left, signals are picked up on an aerial 15 tuned by a Lecher system 14, and are applied directly to a crystal mixer 12. A harmonic of the local oscillator frequency is used for mixing, being applied to the crystal 12 via a filter 11. On this range, the valves 16, 8 comprise respectively a grounded cathode and grounded grid stage operating at intermediate frequency, being coupled together by inductance 18 which is tuned by circuit capacity. In another embodiment, Fig. I (not shown), a pentode R.F. amplifier is used on the lower frequency range and is inoperative on the higher range; on this range I.F. signals are fed directly from the crystal mixer to the cathode of the triode mixer of the lower frequency range, which operates on the higher range as a grounded grid I.F. amplifier.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL720760X | 1952-03-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB720760A true GB720760A (en) | 1954-12-29 |
Family
ID=19816205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5537/53A Expired GB720760A (en) | 1952-03-03 | 1953-02-27 | Improvements in or relating to radio receiver circuits for at least two ultra high-frequency ranges |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE970418C (en) |
GB (1) | GB720760A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1266796B (en) * | 1953-10-24 | 1968-04-25 | Standard Elektrik Lorenz Ag | Combined television and radio receiver |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE645324C (en) * | 1931-09-17 | 1937-05-26 | Kolster Brandes Ltd | Superheterodyne receiver |
DE659199C (en) * | 1933-09-30 | 1938-04-27 | Rca Corp | Intermediate frequency receiver for several wavebands |
US2150553A (en) * | 1936-05-29 | 1939-03-14 | Rca Corp | Multiwave band superheterodyne receiver |
-
1953
- 1953-02-27 GB GB5537/53A patent/GB720760A/en not_active Expired
- 1953-03-01 DE DEN6823A patent/DE970418C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE970418C (en) | 1958-09-18 |
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