- TECH

Report
Anritsu Mobile Interference
Hunting System
Interference Hunting Made Easy
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Mobile Interference Hunting System
• Anritsu mobile interference hunting system is designed to
automatically identify and locate sources of interference
– Maps provided on tablet/laptop provide directions to locate
interference sources
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Mobile Interference Hunting System
• Basic configuration for the Anritsu interference hunting
system:
– MX280007A InterferenceHunterTM Software
– Anritsu handheld spectrum analyzer
– Off-the-shelf omnidirectional magnet mount RF antenna with
GPS (or use separate GPS antenna)
– Windows Tablet (recommended) or PC with Windows 7 or 8
operating system running the MX280007A software
Antenna 2000-1647-R
Windows Tablet with Mounting Hardware
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Anritsu Handheld Spectrum Analyzer
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InterferenceHunter User Interface
Breadcrumbs ‘Power v Color’ Chart
Power vs Time/Position
GPS positions car
location on map
Grey circle indicates
probable interferer location
Colored “breadcrumbs’
left along drive indicating
power levels along drive
User Interface for mobile interference hunting system
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Mobile Interference Hunting System
• Wide frequency range (9 kHz to 43 GHz possible)
– with appropriate Anritsu handheld spectrum analyzer and antenna
• Compatible with most existing Anritsu HH spectrum
analyzers - (no firmware updates needed, GPS required)
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Mobile Interference Hunting System
• Type of Interferers Found
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Low power
Narrowband, wideband
Modulated
Pulsed signals (similar to radar)
Signals hidden in LTE uplink channels
“Black” TV/radio stations & BTS
cellular equipment operating illegally
• Channel Power Measurements Used
– Track signals drifting in frequency
– Track both wideband and narrowband
interference
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Spectrum Analyzer in Channel Power Mode
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Mobile Interference Hunting System
Shown with Anritsu Part No. 2000-1647-R Antenna
• Mobile Interference Hunting System Startup
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Connect Spectrum Analyzer to tablet with USB cable
Set analyzer RBW/VBW, Frequency, Channel BW, GPS ON, Preamp
Load Map into MX280007A, adjust settings as needed
Start the system and begin driving
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Mobile Interference Hunting System Maps
• MX280007A works with both
GoogleMapsTM and OpenStreetMapTM
– GoogleMaps requires an internet connection
(a USB modem is typically used)
• Care must be taken so modem frequencies do not
interfere with signals being hunted
– OpenStreetMap is downloaded to tablet/PC hard disk and
imported into the interference hunting program
• Maps/Instructions for OpenStreetMap can be found here:
– http://www.anritsu.com/en-US/Products-Solutions/Products/Maps.aspx
Both mapping systems are open source and free of charge !
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Special Features & Capabilities
• Interference within LTE uplink bands difficult to hunt
– Traffic information often masks presence of interference
– Anritsu ‘Min Hold’ setting eliminates LTE traffics signals
from measurement consideration
Comparison of LTE Uplink Band screenshots taken before and after MIN HOLD applied n
Interferer obscured by LTE traffic on left can clearly be seen on screen on right
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Other Features & Innovations
• Multi-emitter mode of operation, ideal for finding multiple
leakage sources such as cable TV
• Extensive on-site Help Menu
• Zoom In/Out controls provided
• Full-Screen Spectrum View on tablet
• Visual indicators show power levels
along drive path
• Ability to capture and store interference hunt log files for later
playback and analysis
• Squelch Control to optimize hunting for low-level signals
• Voice Prompts – enables one-person operation !
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Finding CATV Interference
CATV Leakage tends to occur
at multiple locations in a
neighborhood.
Select ‘Multiple Emitter’
from ‘Mode’ tab.
Enter Threshold level.
Drive along various streets in
the neighborhood.
Multiple locations will be
identified on map indicating
positions of interference
sources.
Sample CATV Spectrum
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Spectrum Clearing
Identify areas where signals
may exceed a user settable
threshold
Select ‘Spectrum Clearing’
from ‘Mode’ tab.
Enter Threshold level.
Drive in area of interest.
Multiple locations will be
identified on map showing
threshold exceptions.
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‘Burst Mode’ Available for Receiver-like Speeds
• To find extremely fast signal pulses, Anritsu has
developed “Burst Detect”
•
Uses FFT technology to capture and process intermittent
signals
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Capable of 20,000 measurement per second, 15 MHz bandwidth…
Entire span captured simultaneously
Available on MS2720T Spectrum MasterTM, the MT8220T
BTS MasterTM, and the MS203xC VNA MasterTM
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Log Files - San Francisco
• Next set of slides depict interference hunting
process in San Francisco Financial District.
• Interference signal hidden downtown SF
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Total hunt time approximately 20 minutes
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Mobile Interference Hunting
System
Vehicle
Position
Position
Estimate
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Mobile Interference Hunting
System
Vehicle
Position
Position
Estimate
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Copyright© ANRITSU
Mobile Interference Hunting
System
Vehicle
Position
Position
Estimate
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Copyright© ANRITSU
Mobile Interference Hunting
System
Vehicle
Position
Position
Estimate
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Copyright© ANRITSU
Mobile Interference Hunting
System
Vehicle
Position
Position
Estimate
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Copyright© ANRITSU
Mobile Interference Hunting
System
Vehicle
Position
Position
Estimate
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Key Differentiators
•
Value
•
•
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Eliminate need for expensive proprietary antenna
Spectrum Analyzer can be re-purposed for other applications
(signal analysis, demodulations, etc)
One person operation
• Frequency Range
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High Sensitivity
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9 kHz to 43 GHz possible
Detect signal from further distances
User Friendliness & Driver Safety
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Requires < 5 min setup, 1-person operation)
Small unobtrusive antenna
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Additional Equipment for Interference Hunt
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Anritsu mobile interference hunting system allows the
user to find interference positions quickly and easily
•
For pin-pointing exact interference locations (such as on
rooftops or inside office buildings), the MA2700A Handheld
InterferenceHunter can be used
MA2700A
Pinpointing interference location with MA2700A
Opt 25 Mapping
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Anritsu Mobile Interference Hunting System
Interference Hunting Made Easy
Thanks
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