VERON manmade noise measurement campaign Purpose To gain insight in actual manmade noise levels today The number of RFI signals At a sample of radio amateur sta@ons In various types of environment Focus on manmade broadband noise from local sources + RFI
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VERONmanmadenoisemeasurementcampaign
Purpose
Togaininsightinactualmanmadenoiselevelstoday
ThenumberofRFIsignals
Atasampleofradioamateursta@ons
Invarioustypesofenvironment
Focusonmanmadebroadbandnoisefromlocalsources+RFI
SetupofthemeasurementcampaignSixtypesofenvironmentaredefined:
1. QuietRural:nohabita@on,noinfrastructureswithin2km.
2.Rural:upto10addresseswithin100m,>100mfrombuilt-uparea.
3.Residen@al1:11–50addresseswithin100m.
4.Residen@al2:51–100addresseswithin100m.
5. Residen@al3:>100addresseswithin100m.
6. Residen@al4:largeappartementbuildings&cutycenters.
Foreverytypeofenvironmentmeasurementsareperformedat10loca@ons.
BandsAllamateurradiobandsfrom472kHzto50MHz,including5MHz.
Timingofthemeasurements472kHz–10MHzdirectaZernoon
14–28MHzbeforenoon
50MHzfinally
Thisischoosentodiscriminatethelocalmanmadenoisefromtheskywavenoise,usingthea\enua@onbytheD-layer.
Measurementequipment
1. Rohde&SchwarzmeasuringreceiverESH2,9kHz–30MHz
2. Highsensi@veloopantenna472kHz–10MHz(PA0KDF)
3. Highsensi@veloopantenna14MHz–28MHz(PA0KDF)
4. Ac@vedipole&downconvertor50->10MHz(PA0KDF)
5. Datalogger,basedonRaspberryPicomputer+ADCboard
Allantennasarecalibratedincoopera@onwithRadioAgencyNL
DataprocessingbythedataloggerESH2o/pvoltagedigi@zedandtranslatedintoelectricalfieldstrengthindBµV/m.
Antennafactor,antennanoisefloor,bandwidthconversionmeasurementbandwidth(500Hz)intoreferencebandwidth(2.7kHz),correc@onnumbersforaveragedetectorandlogamplifier,aretakenintoaccountofinthedataloggersoZware.
Ameasurementisdoneinaperiodof30secondsandanaverageEiscalculated.Thenantennaisrotated90°,andasecondmeasurementisdone.Thisresultsinahighestvalue,ameanvalue,andalowestvaluepermeasurementfrequency.
Twotypesofmeasurements
1. Measurementsofthefloorofbroadbandnoiseineachband.
2. MeasurementsofRFIsignals,broadband(>500Hz),andnarrowband(<500Hz).
Forthemeasurementsofthenoisefloor,measurementsaredoneonatleast2frequencies,dependingonthewidthoftheband.
Probandtheresultsaresavedinaplotfileandinadatafile.
Postprocessing
Acomprehensiveplotismadeshowingallthemeasurementresultsforaloca@onforallbands,andrelateittoITUmanmadenoisedata.
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