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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 stage

Info

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
Application number
FR7818633A
Other languages
French (fr)
Other versions
FR2395649B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of FR2395649A1 publication Critical patent/FR2395649A1/en
Application granted granted Critical
Publication of FR2395649B1 publication Critical patent/FR2395649B1/fr
Granted legal-status Critical Current

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.
FR7818633A 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 Granted FR2395649A1 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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
FR2395649B1 (en) 1983-07-08
BE868274A (en) 1978-10-16
DE2727705C2 (en) 1985-07-18
DE2727705A1 (en) 1979-01-11

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse