EMC Evaluation at Green Bank: Emissions and Shield Effectiveness
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1 EMC Evaluation at Green Bank: Emissions and Shield Effectiveness National Radio Astronomy Observatory Carla Beaudet Green Bank RFI Group Leader
2 Emissions Evaluation: Standards ITU-R RA.769 specifies (typical) power flux density (PFD) threshold of detectabilty for RA receivers. Does NOT translate to Radiated Power of Device without specifying a distance FCC Class B CISPR 22 specifies allowable field strength at a given distance. Translates to Radiated Power of Device 2
3 Emissions Evaluation: Practical Limitations and Policy Options for not creating self-interference: 500km! radius electronic device-free zone!!!! Contain ALL electronic equipment on site with large enclosures, or position facilities behind natural obstacles. Use a practical (compromise) approach, but set policy and adhere to it! 3
4 Emissions Evaluation: Practical Limitations and Policy Zone 1Policy: 2 No transmitters! (except 43MHz site radios) site radios. Electronics that will be mitigated to All comply Installed with Electronics ITU-R RA.769 must include: comply with Anything ITU-R RA.769 that cannot be easily No powered electronic off toys; use of electronics must Anything be work-related. that radiates (~50K in excess of visitors/year) FCC part 15 class B levels. 4
5 Emissions Evaluation: Assessing Equipment for Compliance with ITU-R RA.769 Spectrum Analyzer Setup and Measurement Results Observed RFI Feature Measured Frequency ( MHz ) Corresponding Wavelength ( meters ) Measured Peak Power ( dbm ) Amplifier Spectrum Analyzer Resolution Bandwidth ( MHz ) Measured Half-Power Bandwidth ( MHz ) Equipment Under Test (EUT) Receive (Rx) Antenna Signal Characteristics CW CW CW CW Measured Power Per Unit Resolution Bandwidth ( dbw/hz ) Test Setup and Total Radiated Power Per Unit RBW Measured During Test Test Antenna Number ( Select 1, 2, 3, or 4 from Equipment Table ) 2 Cable 2 #1 2 2 Test Amplifier Number ( Select 1 through 7 from Equipment Table ) Test Antenna Gain ( dbi ) Equivalent Test Antenna Collecting Area ( m*m ) Total Transmission Line Loss ( db ) (modify if different cables used) Preamplifier Gain ( db ) Distance From DUT to Test Antenna ( meters ) Calculated Test Setup Space Loss ( db ) Total Radiated Power Per Unit RBW Measured During Test ( dbw/hz ) Predicted Field Strength at Target Distance Anticipated Distance to GBT ( meters ) Calculated Field Strength at Target Distance ( dbw/m*m/hz ) Predicted Impact on GBT Observations Predictions for CONTINUUM OBSERVATIONS Corresponding Target GBT CONTINUUM Bandwidth ( MHz ) Corresponding Target GBT CONTINUUM Limit ( dbw/m*m/hz ) Distance (D test ) Calculated Field Strength Per Unit CONTINUUM Bandwidth ( dbw/m*m/hz ) Calculated Field Strength Per Unit CONTINUUM Bandwidth ( Jy ) 8.46E E E E+05 Feature Exceeds Target CONTINUUM Limit By ( dbw/m*m/hz ) Spectrum Analyzer Predictions for SPECTRAL LINE OBSERVATIONS Corresponding Target GBT SPECTRAL LINE Bandwidth ( MHz ) Corresponding Target GBT SPECTRAL LINE Limit ( dbw/m*m/hz ) Calculated Field Strength Per Unit SPECTRAL LINE Bandwidth ( dbw/m*m/hz ) Calculated Field Strength Per Unit SPECTRAL LINE Bandwidth ( Jy ) Cable #3 1.27E E E E+05 Feature Exceeds Target SPECTRAL LINE Limit By ( dbw/m*m/hz ) Cable #2 Power Tx (dbm) = P measured (dbm) + L space (db) G antenna (db) G amplifier (db) + L cables (db) 5
6 Emissions Evaluation: Assessing Equipment for Compliance with ITU-R RA.769 Faraday Cages Low-Pass Filters RF Absorber 6
7 Emissions Evaluation: Assessing Equipment for Compliance with ITU-R RA.769 Spectrum Analyzer Setup and Measurement Results Observed RFI Feature Measured Frequency ( MHz ) Corresponding Wavelength ( meters ) Measured Peak Power ( dbm ) Amplifier Spectrum Analyzer Resolution Bandwidth ( MHz ) Measured Half-Power Bandwidth ( MHz ) Equipment Under Test (EUT) Receive (Rx) Antenna Signal Characteristics CW CW CW CW Measured Power Per Unit Resolution Bandwidth ( dbw/hz ) Test Setup and Total Radiated Power Per Unit RBW Measured During Test Test Antenna Number ( Select 1, 2, 3, or 4 from Equipment Table ) 2 Cable 2 #1 2 2 Test Amplifier Number ( Select 1 through 7 from Equipment Table ) Test Antenna Gain ( dbi ) Equivalent Test Antenna Collecting Area ( m*m ) Total Transmission Line Loss ( db ) (modify if different cables used) Preamplifier Gain ( db ) Distance From DUT to Test Antenna ( meters ) Calculated Test Setup Space Loss ( db ) Total Radiated Power Per Unit RBW Measured During Test ( dbw/hz ) Predicted Field Strength at Target Distance Anticipated Distance to GBT ( meters ) Calculated Field Strength at Target Distance ( dbw/m*m/hz ) Predicted Impact on GBT Observations Predictions for CONTINUUM OBSERVATIONS Corresponding Target GBT CONTINUUM Bandwidth ( MHz ) Corresponding Target GBT CONTINUUM Limit ( dbw/m*m/hz ) Distance (D test ) Calculated Field Strength Per Unit CONTINUUM Bandwidth ( dbw/m*m/hz ) Calculated Field Strength Per Unit CONTINUUM Bandwidth ( Jy ) 8.46E E E E+05 Feature Exceeds Target CONTINUUM Limit By ( dbw/m*m/hz ) Spectrum Analyzer Predictions for SPECTRAL LINE OBSERVATIONS Corresponding Target GBT SPECTRAL LINE Bandwidth ( MHz ) Corresponding Target GBT SPECTRAL LINE Limit ( dbw/m*m/hz ) Calculated Field Strength Per Unit SPECTRAL LINE Bandwidth ( dbw/m*m/hz ) Calculated Field Strength Per Unit SPECTRAL LINE Bandwidth ( Jy ) Cable #3 1.27E E E E+05 Feature Exceeds Target SPECTRAL LINE Limit By ( dbw/m*m/hz ) Cable #2 Power Tx (dbm) = P measured (dbm) + L space (db) G antenna (db) G amplifier (db) + L cables (db) 7
8 Shield Effectiveness Evaluation 8
9 Shield Effectiveness Evaluation 9
10 Shield Effectiveness Measurement Standard 10
11 Shield Effectiveness Evaluation Highlights of the Test Procedure: 1. Obtain Reference Measurements at distance D. 2. Receiver set to MAX HOLD while moving Rx antenna in a plane parallel to enclosure surface at distance D. 3. Many Measurement locations for most reliable results and to identify problem areas. 11
12 Thank You! 12
Electromagnetic Compatibility at Green Bank: Evaluation and Mitigation
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