JPS5580948A - Fsk radio equipment - Google Patents

Fsk radio equipment

Info

Publication number
JPS5580948A
JPS5580948A JP15505878A JP15505878A JPS5580948A JP S5580948 A JPS5580948 A JP S5580948A JP 15505878 A JP15505878 A JP 15505878A JP 15505878 A JP15505878 A JP 15505878A JP S5580948 A JPS5580948 A JP S5580948A
Authority
JP
Japan
Prior art keywords
modulation signal
reception
transmission
output
signal component
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
JP15505878A
Other languages
Japanese (ja)
Inventor
Kazuo Ogawa
Takayuki Ozaki
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 JP15505878A priority Critical patent/JPS5580948A/en
Publication of JPS5580948A publication Critical patent/JPS5580948A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Transceivers (AREA)
  • Bidirectional Digital Transmission (AREA)

Abstract

PURPOSE:To omit the reception local oscillator by utilizing part of the transmission modulation signal for the reception local oscillation output. CONSTITUTION:The transmission digital signal is modulated directly by FM modulator 22 and then fed to antenna 25 via circulator 24. The reception modulation signal received at antenna 25 is then transmitted to port (3) from (2) of circulator 24. At the same time, part of the transmission power corresponding to the backward attenuation amount which is transmitted from port (1) to (3) is applied to frequency converter 27 along with the reception modulation signal. The 1st intermediate frequency signal delivered from converter 27 contains the transmission modulation signal component but is mixed with the output of voltage control oscillator 33 to be negated. The output of the frequency converter with the transmission signal component negated contains only the reception modulation signal component to be delivered from frequency discriminator 32. In such way, the reception local oscillator can be omitted.
JP15505878A 1978-12-14 1978-12-14 Fsk radio equipment Pending JPS5580948A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15505878A JPS5580948A (en) 1978-12-14 1978-12-14 Fsk radio equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15505878A JPS5580948A (en) 1978-12-14 1978-12-14 Fsk radio equipment

Publications (1)

Publication Number Publication Date
JPS5580948A true JPS5580948A (en) 1980-06-18

Family

ID=15597740

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15505878A Pending JPS5580948A (en) 1978-12-14 1978-12-14 Fsk radio equipment

Country Status (1)

Country Link
JP (1) JPS5580948A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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