JPS55140338A - Transmission and receiving switching circuit - Google Patents

Transmission and receiving switching circuit

Info

Publication number
JPS55140338A
JPS55140338A JP4798079A JP4798079A JPS55140338A JP S55140338 A JPS55140338 A JP S55140338A JP 4798079 A JP4798079 A JP 4798079A JP 4798079 A JP4798079 A JP 4798079A JP S55140338 A JPS55140338 A JP S55140338A
Authority
JP
Japan
Prior art keywords
transmission
terminal
diodes
receiving
resistances
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.)
Pending
Application number
JP4798079A
Other languages
Japanese (ja)
Inventor
Kenji Takizawa
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4798079A priority Critical patent/JPS55140338A/en
Publication of JPS55140338A publication Critical patent/JPS55140338A/en
Pending 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To obtain a cheap and high-reliability circuit which can endure the use even under bad conditions of environment, by providing capacitors, resistances, diodes, and a gate circuit, which controls conduction of diodes, in the secondary- side terminal of an output transformer for transmission. CONSTITUTION:In the transmission and receiving circuit of a fish detector, an underwater sound detector and so on at a transmission time, the transmission signal from terminal 1 is amplified by vacuum tube 2 and is sent to transmitter and receiver 5 through output transformer 3. At this time, a negative voltage is applied to transmission and receiving switching control input terminal 20, and transistor 21 is turned off, and diodes 14 and 15 are not conductive, and the transmission signal is not transmitted to receiving-side output terminal 7. At a receiving time, a positive voltage is applied to terminal 20, and transistor 21 is turned on, and a current is flowed through resistances 16 and 17, diodes 14 and 15, and resistances 12 and 13, and diodes become conductive. Thus, the receiving signal from transmitter and receiver 5 is transmitted to terminal 7 through capacitors 10, 11, 18 and 19.
JP4798079A 1979-04-20 1979-04-20 Transmission and receiving switching circuit Pending JPS55140338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4798079A JPS55140338A (en) 1979-04-20 1979-04-20 Transmission and receiving switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4798079A JPS55140338A (en) 1979-04-20 1979-04-20 Transmission and receiving switching circuit

Publications (1)

Publication Number Publication Date
JPS55140338A true JPS55140338A (en) 1980-11-01

Family

ID=12790451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4798079A Pending JPS55140338A (en) 1979-04-20 1979-04-20 Transmission and receiving switching circuit

Country Status (1)

Country Link
JP (1) JPS55140338A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5934178A (en) * 1982-08-20 1984-02-24 Hitachi Ltd Artificial target device for sonar

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5934178A (en) * 1982-08-20 1984-02-24 Hitachi Ltd Artificial target device for sonar
JPH0126031B2 (en) * 1982-08-20 1989-05-22 Hitachi Ltd

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