JPS5795729A - Radio transmitter and receiver - Google Patents

Radio transmitter and receiver

Info

Publication number
JPS5795729A
JPS5795729A JP55167078A JP16707880A JPS5795729A JP S5795729 A JPS5795729 A JP S5795729A JP 55167078 A JP55167078 A JP 55167078A JP 16707880 A JP16707880 A JP 16707880A JP S5795729 A JPS5795729 A JP S5795729A
Authority
JP
Japan
Prior art keywords
frequency
signal
transmission
circuit
receiving
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
JP55167078A
Other languages
Japanese (ja)
Inventor
Keiji Kanota
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 Denshi KK
Original Assignee
Hitachi Denshi KK
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 Denshi KK filed Critical Hitachi Denshi KK
Priority to JP55167078A priority Critical patent/JPS5795729A/en
Publication of JPS5795729A publication Critical patent/JPS5795729A/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
    • H04B1/54—Circuits using the same frequency for two directions of communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)

Abstract

PURPOSE:To make a radio transmitter and receiver small-size and reduce the number of adjusted positions, by generating a transmission frequency signal by a direct oscillating variable frequency divider type synthesizer and by performing the frequency conversion of the transmission frequency signal to use it as a local oscillation frequency signal at the receiving time. CONSTITUTION:At the transmission time, the oscillation signal from a voltage control variable frequency oscillator 17 of a direct oscillating variable frequency divider type synthesizer 16 is modulated by a sound signal which passes through a microphone 3 and a momentary frequency shift control circuit 4, and this modulated signal is amplified by a power amplifier 6 and is transmitted through an antenna 8. At the receiving time, the output signal of the synthesizer 16 is subjected to frequency conversion by a frequency converting circuit 23, and the output signal from the circuit 23 is used as a local oscillation frequency to subject the receiving signal to frequency conversion in a frequency converting circuit 10, and the sound signal is outputted to a speaker 15 through a demodulating circuit 26. Thus, only a reference quartz oscillator 21 for transmission and a local oscillator 25 for receiving are used as quartz oscillators independently of the number of channels to reduce the number of adjusted positions, and therefore, a device suitable for the radio transmitter and receiver for multiple channels is obtained.
JP55167078A 1980-11-26 1980-11-26 Radio transmitter and receiver Pending JPS5795729A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55167078A JPS5795729A (en) 1980-11-26 1980-11-26 Radio transmitter and receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55167078A JPS5795729A (en) 1980-11-26 1980-11-26 Radio transmitter and receiver

Publications (1)

Publication Number Publication Date
JPS5795729A true JPS5795729A (en) 1982-06-14

Family

ID=15842989

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55167078A Pending JPS5795729A (en) 1980-11-26 1980-11-26 Radio transmitter and receiver

Country Status (1)

Country Link
JP (1) JPS5795729A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6077535A (en) * 1983-10-05 1985-05-02 Hitachi Ltd Simultaneous transmission and reception radio communication equipment
JPS61187136U (en) * 1985-05-10 1986-11-21

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6077535A (en) * 1983-10-05 1985-05-02 Hitachi Ltd Simultaneous transmission and reception radio communication equipment
JPH0563972B2 (en) * 1983-10-05 1993-09-13 Hitachi Ltd
JPS61187136U (en) * 1985-05-10 1986-11-21
JPH0516748Y2 (en) * 1985-05-10 1993-05-06

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