emc presentation convention 2016
Transcript of emc presentation convention 2016
![Page 1: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/1.jpg)
theRSGB @theRSGB
vision valuesgovernance teamwork
EMC– DiagnosingandReportingRFI
of Great Britain
Advancing amateur radio since 1913
Radio Society
Dr John Rogers, M0JAV Chairman EMC Committee
![Page 2: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/2.jpg)
theRSGB @theRSGB
WhatcausesRFI?
![Page 3: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/3.jpg)
theRSGB @theRSGB
WhyisRFIaproblem?• Allelectricaldevicesproduceelectromagneticemissions conducted &/orradiated
• Differentelectricaldevicescanbemoreorlessimmune tointerference
• Problemsarisewhenemissionlevelsarehighenoughtoeffectoperationofotherequipment
• Emission andImmunity standardsaredesignedtoallowdevicestooperatetogether
• RadioamateursandSWLsrelyonlowbackgroundnoiseforgoodradioreception
![Page 4: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/4.jpg)
theRSGB @theRSGB
EMRadioFrequencyInterference(RFI)
![Page 5: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/5.jpg)
theRSGB @theRSGB
WhatServicesdoesEMCCprovide• AdviceandSupport
– HelpandadvisememberswithRFIproblems• EMCMattersForumandproblemreporting• RSGBwebsiteself-diagnosisusingEMCleaflets
– Provideupdatesthroughwebpagesandpublications• RegularEMCcolumninRadcom – “EMCMatters”
• ProtecttheSpectrumfromRFI– RepresentationonStandardsCommittees– Lobbyingregulators,suppliersandserviceproviders– InvestigationsofNewTechnologyInterference– Recommendationsfornewthreats
![Page 6: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/6.jpg)
theRSGB @theRSGB
RSGBEMCCServiceChanges• HelpDeskandEMCMattersForum
– EMCMattersForumvisited93000timessinceApril2015– Leafletsandpublicationsupdatedaimedatselfhelp– HelpDesk- Over100reportsperannum- viaemailandtelephone– Onlineproblemreportinghelpsuslobbyingsuppliersandregulators
• NewprocessforInvestigatingRFIproblemsusing– Assisteddiagnosisusingsignatureexamples– spectra,waterfalls,recordings– Helpsyoufindwhere itis,when itisoperatingand whatitis
• Ofcom adviceandassistance– ReluctanttoenforceagainstnonWTAapparatus– NewStatutoryInstrumenttocoverinserviceequipment– RSGBpreparingreportsonresultsofinvestigations
![Page 7: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/7.jpg)
theRSGB @theRSGB
HelpDesk,ForumandReportingTypeofRFI Number
ofcasesNumberresolved
Comment
VDSL 105 5 Linebalanceandextension fix
PlasmaTV 30 26 PanasonicandSamsungsetsreplaced
SolarPV 18 4 Problem usuallyOptimisersorInvertorscanbeaffected bywiringlayout
SMPSU 11 9 Probablymostcommonsourcemostpeopleidentifyproblemanddon’treportit
Homeappliances 8 4 Fridges,Boilers,Alarms
LEDLighting 5 3 MostOKsomebadfloodlightsand12Vonesoftenaproblem
Pylons,Industrialetc 9 5 Outstandingwindfarmproblems
Breakthrough 9 3 Telephones,POS,HiFi,TVdistributionamps
![Page 8: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/8.jpg)
theRSGB @theRSGB
Involve Outsiders?
Liaise with Supplier to
alleviate problem
Problem Resolved ?
Assign an RSGB
Investigator
Record Outcome Lessons Learned, update signature database, Close Case
Yes
Yes No
No
Yes
Problem referred to RSGB from Ofcom
Interference Problem reported to RSGB via phone, forum or online
report
Assign an Advisor Case # Assigned
Request Basic Information
Frequency, Type, Location, Times
Identify class of interference
and collect signature
Compare with other similar cases
to identify common items
Diagnose type and collect
further characteristics
Locate source and record times
active
Record signatures prepare
full report
Signatures Logsheets
Evidence of Harmful
Interference Location Records
Ofcom accept case and follow
standard process
New Investigations Process
Problem recorded on standard form Advisor assigned to assist
Likely source DiagnosedLocatedRecorded
If cannot be resolved locallythen collate cases to approach Ofcom or Supplier
Investigate further and recordHarmful Interference
Log to show Degradation, Obstruction or Repeated Interruption
Steps to reduce Interference
![Page 9: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/9.jpg)
theRSGB @theRSGB
RFISignaturesseeEMC04• Narrowband afewspotfrequencies,onanSSBreceiver,atrue
narrowbandsourcewouldbeheardasatone,butinsomecasesitwillbearoughburblingsignalcoveringafewkHz
• Broadbandwithnopeaksappearsrightacrossabandataboutthesamelevelwithnopeaks
• Broadbandwithbroadpeaksfromswitch-modepowersupplies/digitalelectronicsproducebroadbandemissionswithregularlyspacedbroadpeaksatfundamentalfrequency
• Broadbandwithnarrowpeaksdigitalelectroniccircuitry• Driftmeasurethetimeperioditgivesaclue• Modulation50or100Hzbuzzmainssynchronous– SMPSU• WhitenoiseoftenxDSL• Sigidwiki.com containssignaturesofknownsystemsandsome
unknownsandinterference;wecouldaddtothisordevelopsimilar
![Page 10: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/10.jpg)
theRSGB @theRSGB
Interference Problem reported via phone,
forum or online report
Assign an Advisor Case # Assigned
Request Basic Information
Frequency, Type, Location, Times
Broadband No Peaks
peaks
Harmonic Peaks
Narrowband
N
No
No
xDSL
Electric Motor
Ignition System
Arc / Spark
Yes
SMPSU
Solar Invertor
CFL / LED
PLT
No
No
No
No
No
No
No
Crystal
Alarm
Radar
Yes
yes
Electric Fence
No
No
No
Guidance note Provided1) In each case a spectralPlot / Waterfall is providedtogether with a video / soundclip giving the device signature.2) A standard form to record the device fingerprint and other useful information is supplied.3) Possible Cures are suggested.
4) Advise on how to locate the source and how to approach and work with ownerLeaflet provided, Standard form used to record location, characteristics & times
Involve Outsiders?
Involve Supplier?Involve Ofcom?
Problem Resolved ?
Assign an Investigator
Record Outcome Lessons Learned, update signature database, Close Case
Yes
Yes No
No
Yes
Plasma
No
Comparison with Signature sheets to identify likely sourceCorrelation used to confirm some sources
Guidance notes on what to look for
Linked to advice leaflets for minimising impact
Record actual Signature to add to database
![Page 11: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/11.jpg)
theRSGB @theRSGB
• Frequenciestocheck• Whattolookforandrecord;bestreceiversetupstouse• Timeprofileofinterference
RFI Signature Sheets - VDSL Upstream 2
![Page 12: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/12.jpg)
theRSGB @theRSGB
VDSLduringTraining
11/10/201412
Carriers4kHzapart
Carriersacrossupstreamanddownstreambands
![Page 13: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/13.jpg)
theRSGB @theRSGB
ComputerSMPSU10to18MHz
![Page 14: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/14.jpg)
theRSGB @theRSGB
ComputerSMPSU19to27MHz
![Page 15: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/15.jpg)
theRSGB @theRSGB
LeadAcidBatteryCharger
![Page 16: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/16.jpg)
theRSGB @theRSGB
LEDlighting
![Page 17: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/17.jpg)
theRSGB @theRSGB
SolarPVSpectra
• Mitigation– DCcablesshouldberunascloselyspacedpairs– Clip-onferritesmayberequiredonDCcables– Maybenecessarytochangeinverteroroptimisers
11/10/201417
Broad band emissions up to 40dB above typical back-ground noise level on 10.1 –10.15 MHz band
![Page 18: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/18.jpg)
theRSGB @theRSGB
PlasmaTV• Problems may
increase as the plasma ages
• Cooperation of the set owner is key as suppliers will only deal with them
• Problem will go away as sets go out of production
• “yourequipmentshallnotcauseinterference…”notenforcedbyOfcomorBBC• Contact Ken Underwood G3SDW directly or via the EMC Matters forum he
has good record with manufacturers getting problems resolved particularly with Panasonic and Samsung
![Page 19: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/19.jpg)
theRSGB @theRSGB
FluorescentLighting
Starter and electronic ballast cause the problemGood Earth at RF, screening and ferrites on leads to ballast helpFilter the shack supply to reduce conducted emissions
![Page 20: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/20.jpg)
theRSGB @theRSGB
FaultyCHPump
Carriers every 15kHz modulated with water flow
![Page 21: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/21.jpg)
theRSGB @theRSGB
Thisiswhereyoucanhelpus!!!• HowmanyofyouhaveorcanborrowanSDR?• Howmanyhaveaknownsourceofinterference?• Pleasemakesomespectra/waterfallpicturesorsoundrecordingswecanaddtothedatabase
• Confirmsourcewithon-off-ontest• UseofSpectraandWaterfalldisplays
– Avoidoverloadingthereceiver– gainsettings– Selectfrequencyrange(filtering),resolutionandaveragingsuitableforinterferencetype
– Bewareofcheapdongleswithpoorfilteringwhichgivealiasesofactualsignal
![Page 22: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/22.jpg)
theRSGB @theRSGB
Standards
• InternationalandEuropeanStandardsdesignedtoprotectagainstRFI
• Regulationscanpreventequipmentbeingputonthemarketifnotcompliant
• WTASection54allowsOfcomtomakeRegulationstostoptheuseofapparatusthatiscausingundueinterference
![Page 23: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/23.jpg)
theRSGB @theRSGB
Ofcom:WTAInterference• WTASection4requiresOfcom toprovideadviceandassistancetocomplainantsofInterference
• WTASection54Ofcom canregulateformaximumEMenergythatcanberadiatedandconductedtomains
• Ofcom shouldregulatetoensurethatapparatusdoesnotcauseundueinterferencewithwirelesstelegraphy
• RecentS54regs extendtoapparatusthatisimproperly— (i)installed;(ii)assembled;(iii)maintained;(iv)functioningduetodegradation,deterioration,modification,ordamage;or(v)usedforapurposeotherthanitsintendedpurpose
• Ofcom canthenenforceunderSection55ofWTA
![Page 24: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/24.jpg)
theRSGB @theRSGB
EnforcementOfcom requirements• MustbeevidenceofActualHarmfulInterference
– degrades,obstructsorrepeatedlyinterruptsanythingwhichisbeingbroadcastorotherwisetransmitted...bywirelesstelegraphyandinaccordancewithalicence
– Tighterwhenemergency/safetyservicesimpacted• ApparatusresponsibleisIdentified• Allreasonablestepstominimise impacthavebeentakenbypersonsufferingRFI
• OnbalancePublicInterestisserved– InaBalanced,transparent,proportional,accountableway
![Page 25: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/25.jpg)
theRSGB @theRSGB
HarmfulInterferenceEvidencetocollect
• HereandThere– usetwolocationsonewithInterferenceandoneclosebywithout,usetwoequivalentsetupsandlogatboth– automateifpossible
• NowandThen– keeplogsofcontactswhichwereandwerenotmadebeforetheinterferenceandcontrastwithsituationnow
• Withandwithout– locateandeitherturnoffornulltheinterferencetoshowstationsworkablewhenInterferenceisabsent
• Remember needtodemonstrateactualnotpotentialHarmfulInterference- nogoodjustquotingRFIlevel
![Page 26: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/26.jpg)
theRSGB @theRSGB
UpdateonInvestigations
• xDSL – Investigationsreport(172pages)preparedforRSGB,BT,Ofcom meeting
• SolarPVstillcollectingdataonnoisyunits• LEDLighting– reportstoTradingStandardsondefectiveunits
• Windfarms– AllavenuesexploredbyTom:Ofcom,MP’s,MEP’s,Suppliers,Ombudsman
![Page 27: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/27.jpg)
theRSGB @theRSGB
![Page 28: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/28.jpg)
theRSGB @theRSGB
ThankYouforyourattention
![Page 29: emc presentation convention 2016](https://reader034.fdocuments.net/reader034/viewer/2022051522/588efa781a28ab015a8b75d1/html5/thumbnails/29.jpg)
theRSGB @theRSGB
MinimumSignalsdetectablebyAntenna