JPS5746546A - Radio equipment having turning back function - Google Patents

Radio equipment having turning back function

Info

Publication number
JPS5746546A
JPS5746546A JP55122252A JP12225280A JPS5746546A JP S5746546 A JPS5746546 A JP S5746546A JP 55122252 A JP55122252 A JP 55122252A JP 12225280 A JP12225280 A JP 12225280A JP S5746546 A JPS5746546 A JP S5746546A
Authority
JP
Japan
Prior art keywords
signal
sent
tone
receiving
transmission
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
JP55122252A
Other languages
Japanese (ja)
Inventor
Mitsuo Toritani
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 JP55122252A priority Critical patent/JPS5746546A/en
Publication of JPS5746546A publication Critical patent/JPS5746546A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation
    • H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
    • H04L1/243—Testing correct operation by comparing a transmitted test signal with a locally generated replica at the transmitter, using a loop-back

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To check operations of the whole of the device including the modulating and demodulating circuit of a radio equipment, by constituting the device so that the transmission signal can be converted to a receiving frequency and be turned back and be received by the station itself. CONSTITUTION:A turning back command is sent to an I/O 4 through a data bus, and a processor 1 decodes this command, and a driving signal is sent to a tone oscillator 5, and transmission and receiving channels to be tested are designated here, and a transmitter 6 is turned on. The output signal from the transmitter 6 is sent to a mixture 11 through a coupler 9 and is mixed with the oscillation frequency of an oscillator 12 and is converted to a receiving signal of the station itself and has the level adjusted by an attenuator 13 and is given to a receiver 7. This output signal is amplified by a tone receiver 8 and is sent to the I/O 4. This receiving tone signal and the transmission tone signal are collated with each other by the processor 1 to discriminate normality or abnormality of operations.
JP55122252A 1980-09-05 1980-09-05 Radio equipment having turning back function Pending JPS5746546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55122252A JPS5746546A (en) 1980-09-05 1980-09-05 Radio equipment having turning back function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55122252A JPS5746546A (en) 1980-09-05 1980-09-05 Radio equipment having turning back function

Publications (1)

Publication Number Publication Date
JPS5746546A true JPS5746546A (en) 1982-03-17

Family

ID=14831348

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55122252A Pending JPS5746546A (en) 1980-09-05 1980-09-05 Radio equipment having turning back function

Country Status (1)

Country Link
JP (1) JPS5746546A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0398545U (en) * 1990-01-30 1991-10-14

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0398545U (en) * 1990-01-30 1991-10-14

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