JPS557607A - Digital display system by measuring sum or difference between two frequencies - Google Patents

Digital display system by measuring sum or difference between two frequencies

Info

Publication number
JPS557607A
JPS557607A JP7937778A JP7937778A JPS557607A JP S557607 A JPS557607 A JP S557607A JP 7937778 A JP7937778 A JP 7937778A JP 7937778 A JP7937778 A JP 7937778A JP S557607 A JPS557607 A JP S557607A
Authority
JP
Japan
Prior art keywords
measurement
frequency
frequencies
output
digital display
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
JP7937778A
Other languages
Japanese (ja)
Inventor
Koji Moriai
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.)
Yaesu Musen Co Ltd
Original Assignee
Yaesu Musen Co 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 Yaesu Musen Co Ltd filed Critical Yaesu Musen Co Ltd
Priority to JP7937778A priority Critical patent/JPS557607A/en
Publication of JPS557607A publication Critical patent/JPS557607A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

PURPOSE: To avoid the occurrence of error due to the superposition of measurements, by providing pause time for each measurement of carrier frequency and local oscillating frequency.
CONSTITUTION: The output F through NAND8 for the outputs D and E obtained through the 3 input NAND's 6 and 7 respectively for the carrier frequency f1 and the local oscillation frequency f2 has the frequencies f1 and f2 alternately at the gate time of (N-1)t and the pause time t is placed at the middle. Further, the relation of waveform is synthesized with one clock, then the gate time for frequency measurement can be determined by selecting the period t of the clock input and N of the N notation counter 1. Accordingly, the measurement of the output of the NAND 8 at the frequency counter 9 and the digital display of it through the decoder 10 on the display unit 11 represent the operating frequency. When the measurement is finished, although the display unit 11 is set with the signals G and H differentiating and amplifying the output of the monostable multivibrator 12, since this operation is made at pause time, the error in measurement can be avoided.
COPYRIGHT: (C)1980,JPO&Japio
JP7937778A 1978-06-30 1978-06-30 Digital display system by measuring sum or difference between two frequencies Pending JPS557607A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7937778A JPS557607A (en) 1978-06-30 1978-06-30 Digital display system by measuring sum or difference between two frequencies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7937778A JPS557607A (en) 1978-06-30 1978-06-30 Digital display system by measuring sum or difference between two frequencies

Publications (1)

Publication Number Publication Date
JPS557607A true JPS557607A (en) 1980-01-19

Family

ID=13688171

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7937778A Pending JPS557607A (en) 1978-06-30 1978-06-30 Digital display system by measuring sum or difference between two frequencies

Country Status (1)

Country Link
JP (1) JPS557607A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5275416U (en) * 1975-12-03 1977-06-06

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5019404A (en) * 1973-05-10 1975-02-28

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5019404A (en) * 1973-05-10 1975-02-28

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5275416U (en) * 1975-12-03 1977-06-06

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