FR2354603A1 - AM-FM transceiver alarm system - has parasitic signal limiter and thyristor controlled alarm circuit applicable to superheterodyne receiver stage - Google Patents

AM-FM transceiver alarm system - has parasitic signal limiter and thyristor controlled alarm circuit applicable to superheterodyne receiver stage

Info

Publication number
FR2354603A1
FR2354603A1 FR7539893A FR7539893A FR2354603A1 FR 2354603 A1 FR2354603 A1 FR 2354603A1 FR 7539893 A FR7539893 A FR 7539893A FR 7539893 A FR7539893 A FR 7539893A FR 2354603 A1 FR2354603 A1 FR 2354603A1
Authority
FR
France
Prior art keywords
parasitic signal
transceiver
circuit
superheterodyne receiver
receiver stage
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.)
Withdrawn
Application number
FR7539893A
Other languages
French (fr)
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.)
LOBELSON ALBERT
Original Assignee
LOBELSON ALBERT
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 LOBELSON ALBERT filed Critical LOBELSON ALBERT
Priority to FR7539893A priority Critical patent/FR2354603A1/en
Publication of FR2354603A1 publication Critical patent/FR2354603A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B23/00—Alarms responsive to unspecified undesired or abnormal conditions

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmitters (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

The transmitter has a timing circuit which uses an LED which actuates two NPN or PNP transistors (T1, T2). The bases of the transistors (T1) (T2) are separated by diodes (D1 and D2). The circuit is designed to have a low battery current conduction when the LED contact is closed or open. The receiver of the conventional superheterodyne type with an amplifier used as a limiter connected to an integrated circuit decoder. It has a signal sampling synchronising circuit, a reference signal oscillator, low and high pass RC filters. It also has a reference signal comparator, logic gate and 'ALL or Nothing' transistor switch. At the output of the decoder is a parasitic signal limiter.
FR7539893A 1975-12-19 1975-12-19 AM-FM transceiver alarm system - has parasitic signal limiter and thyristor controlled alarm circuit applicable to superheterodyne receiver stage Withdrawn FR2354603A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7539893A FR2354603A1 (en) 1975-12-19 1975-12-19 AM-FM transceiver alarm system - has parasitic signal limiter and thyristor controlled alarm circuit applicable to superheterodyne receiver stage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7539893A FR2354603A1 (en) 1975-12-19 1975-12-19 AM-FM transceiver alarm system - has parasitic signal limiter and thyristor controlled alarm circuit applicable to superheterodyne receiver stage

Publications (1)

Publication Number Publication Date
FR2354603A1 true FR2354603A1 (en) 1978-01-06

Family

ID=9164217

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7539893A Withdrawn FR2354603A1 (en) 1975-12-19 1975-12-19 AM-FM transceiver alarm system - has parasitic signal limiter and thyristor controlled alarm circuit applicable to superheterodyne receiver stage

Country Status (1)

Country Link
FR (1) FR2354603A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7256761B2 (en) * 2003-03-04 2007-08-14 Chunghwa Picture Tubes, Ltd. Scanner integrated circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7256761B2 (en) * 2003-03-04 2007-08-14 Chunghwa Picture Tubes, Ltd. Scanner integrated circuit

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Legal Events

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