FR2395649A1 - VHF radio receiver input circuit - has primary oscillator working at higher frequency than received signal to generate intermediate frequency in mixer stage - Google Patents
VHF radio receiver input circuit - has primary oscillator working at higher frequency than received signal to generate intermediate frequency in mixer stageInfo
- Publication number
- FR2395649A1 FR2395649A1 FR7818633A FR7818633A FR2395649A1 FR 2395649 A1 FR2395649 A1 FR 2395649A1 FR 7818633 A FR7818633 A FR 7818633A FR 7818633 A FR7818633 A FR 7818633A FR 2395649 A1 FR2395649 A1 FR 2395649A1
- Authority
- FR
- France
- Prior art keywords
- frequency
- input circuit
- mixer stage
- received signal
- radio receiver
- 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.)
- Granted
Links
Classifications
-
- 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)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The input circuit is for radio receivers working in the VHF band. The circuit overcomes problems associated with oscillator switching that can occur in television receivers and is based on the use of a primary local oscillator working at a frequency substantially higher than that being received at the aerial. The primary oscillator frequency is switched through the required range and generates in the first mixer stage an intermediate frequency by mixing with the output from a second and fixed frequency oscillator. A filter network is situated between the two mixers and it is designed to attenuate all but the desired frequencies.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772727705 DE2727705C2 (en) | 1977-06-21 | 1977-06-21 | Television receiver input circuit for the VHF band I and III frequency range with alternating picture and sound carrier frequencies in the receiving channels |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2395649A1 true FR2395649A1 (en) | 1979-01-19 |
FR2395649B1 FR2395649B1 (en) | 1983-07-08 |
Family
ID=6011909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7818633A Granted FR2395649A1 (en) | 1977-06-21 | 1978-06-21 | VHF radio receiver input circuit - has primary oscillator working at higher frequency than received signal to generate intermediate frequency in mixer stage |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE868274A (en) |
DE (1) | DE2727705C2 (en) |
FR (1) | FR2395649A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1142631B (en) * | 1959-07-15 | 1963-01-24 | Loewe Opta Ag | Television receiving circuit |
DE2537831A1 (en) * | 1975-08-26 | 1977-05-12 | Licentia Gmbh | Radio and TV tuner using capacitance diodes - employs twofold frequency conversion, mixing IF with fixed frequency from non:tunable oscillator |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2334570B1 (en) * | 1973-07-07 | 1975-03-06 | Philips Patentverwaltung | Tunable radio frequency input circuitry for a television receiver |
-
1977
- 1977-06-21 DE DE19772727705 patent/DE2727705C2/en not_active Expired
-
1978
- 1978-06-20 BE BE188694A patent/BE868274A/en not_active IP Right Cessation
- 1978-06-21 FR FR7818633A patent/FR2395649A1/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1142631B (en) * | 1959-07-15 | 1963-01-24 | Loewe Opta Ag | Television receiving circuit |
DE2537831A1 (en) * | 1975-08-26 | 1977-05-12 | Licentia Gmbh | Radio and TV tuner using capacitance diodes - employs twofold frequency conversion, mixing IF with fixed frequency from non:tunable oscillator |
Also Published As
Publication number | Publication date |
---|---|
DE2727705C2 (en) | 1985-07-18 |
DE2727705A1 (en) | 1979-01-11 |
BE868274A (en) | 1978-10-16 |
FR2395649B1 (en) | 1983-07-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property | ||
ST | Notification of lapse |