JPS5788366A - Apparatus c/n measurement - Google Patents

Apparatus c/n measurement

Info

Publication number
JPS5788366A
JPS5788366A JP16467380A JP16467380A JPS5788366A JP S5788366 A JPS5788366 A JP S5788366A JP 16467380 A JP16467380 A JP 16467380A JP 16467380 A JP16467380 A JP 16467380A JP S5788366 A JPS5788366 A JP S5788366A
Authority
JP
Japan
Prior art keywords
signal
output
phase
intermediate frequency
external input
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.)
Granted
Application number
JP16467380A
Other languages
Japanese (ja)
Other versions
JPS5855456B2 (en
Inventor
Katsuaki Kawagoe
Tadatoshi Yamada
Shunichiro Egami
Teruyoshi Okamoto
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.)
Anritsu Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Anritsu Corp
Nippon Telegraph and Telephone 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 Anritsu Corp, Nippon Telegraph and Telephone Corp filed Critical Anritsu Corp
Priority to JP16467380A priority Critical patent/JPS5855456B2/en
Publication of JPS5788366A publication Critical patent/JPS5788366A/en
Publication of JPS5855456B2 publication Critical patent/JPS5855456B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Superheterodyne Receivers (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE:To control the waveform distortion generated in a phase synchronous loop and to decrease measuring error, by selecting the frequency of an intermediate frequency signal given on a phase difference detector sufficiently larger than that of the intermediate frequency signal given on a branching filter. CONSTITUTION:The external input signal is applied to a freqnency mixer 9 together with the output of a variable local oscillator 5 and an intermediate fre quency signal f1 is outputted. The phase comparison of this signal f1 with the output of a stadard oscillator 10 is carried out by a phase difference detector 11 and the difference output is fed back to the oscillaor 5 through a wave filter 12 and the phase synchroniaation is carried out. On the one hand, the signal f1 is applied to a frequency mixer 14 together with the output of a local oscillator 13 and is converted into a smaller intermediate frequency signal f2 than the signal f1. This signal f2 is applied to a branching filter 15 and separated into a carrier component fc and a noise component fN, then C/N of the external input signal is detected by a level ratio detector 7. Hereby, measuring error can be decreased not subjecting to the influence of noise level even if the waveform distortion is produced.
JP16467380A 1980-11-25 1980-11-25 C/N measuring device Expired JPS5855456B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16467380A JPS5855456B2 (en) 1980-11-25 1980-11-25 C/N measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16467380A JPS5855456B2 (en) 1980-11-25 1980-11-25 C/N measuring device

Publications (2)

Publication Number Publication Date
JPS5788366A true JPS5788366A (en) 1982-06-02
JPS5855456B2 JPS5855456B2 (en) 1983-12-09

Family

ID=15797654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16467380A Expired JPS5855456B2 (en) 1980-11-25 1980-11-25 C/N measuring device

Country Status (1)

Country Link
JP (1) JPS5855456B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6126861U (en) * 1984-07-23 1986-02-18 太陽工業株式会社 Retractable membrane structure
JPH0331807Y2 (en) * 1984-12-28 1991-07-05
JPH0724024U (en) * 1993-10-15 1995-05-09 有限会社中西製作所 Frame material for greenhouse

Also Published As

Publication number Publication date
JPS5855456B2 (en) 1983-12-09

Similar Documents

Publication Publication Date Title
US3221266A (en) Linear sweep frequency generator
JPS5788366A (en) Apparatus c/n measurement
JPS55132164A (en) Carrier regenerating circuit for psk demodulator
US3017505A (en) Receiving apparatus for radio frequency signals
JPS5550175A (en) Received signal processor
JPS56154860A (en) Detection system for frequency difference signal
US2868981A (en) Signal processing arrangement
GB620668A (en) An improved arrangement for reducing the frequency band in the heterodyne reception of frequency-modulated oscillations
FR2451584A1 (en) Noise measurement on spectrally pure oscillator output - utilises narrow band filter tuned to difference between two oscillators
SU454664A1 (en) Frequency comparator
SU1101754A1 (en) Method of measuring phase-shift (its versions)
JPS55149539A (en) Pll circuit
JPS5585145A (en) Phase synchronizer
JPS5741018A (en) Dynamic tracking filter of injection synchronizing oscillator type
SU694819A1 (en) Apparatus for measuring superhigh frequency power
JPS5530282A (en) Communication system
JPS5513507A (en) Noise attenuation circuit of fm receiver
SU469095A1 (en) Device for measuring the parameters of a quasi-monochromatic signal
JPS5468670A (en) Zero cross point detector of signal waves
JPS5554463A (en) Measuring instrument for ratio of noise power to carrier
JPS57162516A (en) Tuning device of spectrum energy comparison system
JPS6451826A (en) Phase locked loop oscillator
JPS57143906A (en) Fm demodulator for composite modulation system
JPS57200870A (en) Phase difference detector
FR2262809A1 (en) Interference suppression circuit for radar receivers - operates on different carrier frequencies little differing from each other