JPS5579540A - Fsk radio unit - Google Patents

Fsk radio unit

Info

Publication number
JPS5579540A
JPS5579540A JP15445678A JP15445678A JPS5579540A JP S5579540 A JPS5579540 A JP S5579540A JP 15445678 A JP15445678 A JP 15445678A JP 15445678 A JP15445678 A JP 15445678A JP S5579540 A JPS5579540 A JP S5579540A
Authority
JP
Japan
Prior art keywords
output
frequency
modulator
circulator
local oscillator
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
JP15445678A
Other languages
Japanese (ja)
Inventor
Nijiro Momo
Kazuo Ogawa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15445678A priority Critical patent/JPS5579540A/en
Publication of JPS5579540A publication Critical patent/JPS5579540A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Transceivers (AREA)
  • Bidirectional Digital Transmission (AREA)

Abstract

PURPOSE: To simplify a radio unit with a receiving local oscillator omitted by applying part of the output of a microwave-band or milliwave-band FM modulator, extracted by a power distributor, to a frequency converter as a substitute for a receiving local oscillator.
CONSTITUTION: A transmission part and reception part, selected so that a difference between a transmission frequency and reception frequency will be an intermediate frequency, are both provided so as to constitute a FSK radio unit. The output of FM modulator 22 of this transimssion part is applied via transmitting filter 23 to power distributor 24, whose output is partially applied to circulator 28 as a substitute for the output of the receiving local oscillator. The output of distributor 24 is applied to transmitting-receiving antenna 26 via circulator 25 to emit a radio wave; and the radio wave received by antenna 26 is applied to circulator 28 and then transmitted and received waves are converted into IF signals by frequency converter 29. Frequency discriminator 32 discriminates frequencies of those IF signals and the sum of the output of discriminator 32 and the input signal of modulator 22 or their difference is calculated by adder 33 to remove an input signal component included in the discrimination output.
COPYRIGHT: (C)1980,JPO&Japio
JP15445678A 1978-12-13 1978-12-13 Fsk radio unit Pending JPS5579540A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15445678A JPS5579540A (en) 1978-12-13 1978-12-13 Fsk radio unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15445678A JPS5579540A (en) 1978-12-13 1978-12-13 Fsk radio unit

Publications (1)

Publication Number Publication Date
JPS5579540A true JPS5579540A (en) 1980-06-16

Family

ID=15584616

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15445678A Pending JPS5579540A (en) 1978-12-13 1978-12-13 Fsk radio unit

Country Status (1)

Country Link
JP (1) JPS5579540A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5773544A (en) * 1980-08-26 1982-05-08 Int Standard Electric Corp Digital single channel double transmission system transceiver
JPS6046622A (en) * 1983-08-24 1985-03-13 Toyo Commun Equip Co Ltd Simultaneous transmitting/receiving communication system using local oscillator of receiver also as channel oscillator of transmitter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS502809A (en) * 1973-03-02 1975-01-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS502809A (en) * 1973-03-02 1975-01-13

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5773544A (en) * 1980-08-26 1982-05-08 Int Standard Electric Corp Digital single channel double transmission system transceiver
JPS6046622A (en) * 1983-08-24 1985-03-13 Toyo Commun Equip Co Ltd Simultaneous transmitting/receiving communication system using local oscillator of receiver also as channel oscillator of transmitter
JPH031851B2 (en) * 1983-08-24 1991-01-11 Toyo Communication Equip

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