JPS57193133A - Simultaneous transmitter and receiver - Google Patents

Simultaneous transmitter and receiver

Info

Publication number
JPS57193133A
JPS57193133A JP56074174A JP7417481A JPS57193133A JP S57193133 A JPS57193133 A JP S57193133A JP 56074174 A JP56074174 A JP 56074174A JP 7417481 A JP7417481 A JP 7417481A JP S57193133 A JPS57193133 A JP S57193133A
Authority
JP
Japan
Prior art keywords
frequency
output
transmission
signal
reception
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
JP56074174A
Other languages
Japanese (ja)
Inventor
Katsumi Ushiyama
Kenzo Urabe
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.)
Kokusai Electric Corp
Original Assignee
Kokusai Electric Corp
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 Kokusai Electric Corp filed Critical Kokusai Electric Corp
Priority to JP56074174A priority Critical patent/JPS57193133A/en
Publication of JPS57193133A publication Critical patent/JPS57193133A/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
    • H04B1/50—Circuits using different frequencies for the two directions of communication

Landscapes

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

Abstract

PURPOSE:To reduce the power consumption of a simultaneous transmission/reception radio equipment, by forming a transmission frequency and a local oscillating frequency for reception through the frequency division, multiplication and mixing of a reference frequency oscillator. CONSTITUTION:An output wave FVCO of a voltage controlled oscillator VCO16 controlled with a signal frequency-dividing 12 a reference frequency fr oscillated with a quartz oscillator 11 is frequency-modulated 18 with a signal obtained from a transmission modulation input Ti through a limiter 19, and a obtained modulated wave ftm is amplified 13 and passes through a common use device 1 as a transmission output P. A frequency fr becomes nfr via an n-multiplier 7 and inputted to a mixer 8, where the ftm from the VCO 16 and the nfr are synthesized and a ftm+ or -nfr wave is applied to a reception mixer 2 through a BPF9 as a local oscillating signal. The output of the mixer 2 is picked up as an intermediate frequency output at a BPF3 and demodulated at a frequency discriminator 5 via a limiter 4. The demodulated output is inputted to an operational amplifier 6, where a transmission signal equalized at a hpase amplitude equalizer 10 is subtrated from the demodulated output to output a reception signal R0.
JP56074174A 1981-05-19 1981-05-19 Simultaneous transmitter and receiver Pending JPS57193133A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56074174A JPS57193133A (en) 1981-05-19 1981-05-19 Simultaneous transmitter and receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56074174A JPS57193133A (en) 1981-05-19 1981-05-19 Simultaneous transmitter and receiver

Publications (1)

Publication Number Publication Date
JPS57193133A true JPS57193133A (en) 1982-11-27

Family

ID=13539527

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56074174A Pending JPS57193133A (en) 1981-05-19 1981-05-19 Simultaneous transmitter and receiver

Country Status (1)

Country Link
JP (1) JPS57193133A (en)

Similar Documents

Publication Publication Date Title
US4520474A (en) Duplex communication transceiver with modulation cancellation
KR860007789A (en) AM receiver
GB551472A (en) Improvements in modulated high frequency carrier wave signalling systems
GB1048328A (en) Radio communication system
SE8103035L (en) RADIORECEIVER
JPS57193133A (en) Simultaneous transmitter and receiver
US4520475A (en) Duplex communication transceiver with modulation cancellation
JPS57192144A (en) Transmitter and receiver
WO1985002734A1 (en) Duplex communication transceiver with modulation cancellation
KR960027410A (en) Satellite broadcast repeater (A pepeater)
JPH071868Y2 (en) Space station transceiver
JPS55132135A (en) Simultaneous transmitting-receiving radio equipment
GB683942A (en) Improvements in apparatus for transmitting and receiving radio oscillations
GB912607A (en) Improvements in frequency stabilised radio oscillation generators
JPS5538737A (en) Dispersive radio transmission device
JPS5560346A (en) Frequency stabilization system
JPS5737906A (en) Fm receiver
GB698018A (en) Improvements in or relating to frequency modulated communication systems
JPS5580948A (en) Fsk radio equipment
JPH09298496A (en) Transmitter-receiver for pilot signal
JPS57178435A (en) Fm transmitter and receiver
JPH0516748Y2 (en)
JPS5745740A (en) Frequency synthesizer
JPS56114453A (en) Fm feedback type demodulating circuit
JPS54139317A (en) Am ssb transmitter/receiver