射频复习材料2Word文档下载推荐.docx
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射频复习材料2Word文档下载推荐.docx
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QuestionNo:
1.(Refertopage8HarmonicsBook2of2).
Withrespecttothe“NatureofDigitalSignals”definethefollowing:
(a)Fundamentalfrequency.
(b)OddHarmonicfrequencies.
(c)EvenHarmonicfrequencies.
(d)Resultantfrequency.
2.(Refertopage9.DigitalSignals.Book2of2).
Definethecharacteristicsof“Pulsecodedmodulationsystems”.
(eg.TherelationshipbetweenTransmissionSpeedandDistance)
3.(Refertopage11.Digitalsignals&
transmissionmediums.Book2of2).
Withreferencetothediagramabovedeterminethefollowing:
(a)Thetypeof“LineCode”represented.
(b)Thebinarydatarepresented.
4.(Refertopage13.Someofthecodesavailable.Book2of2).
(a)Thetypeof“LineCodes”represented.
(c)Theadvantages/disadvantagesofeachcode.
5.(Refertopage13.Someofthecodesavailable.Book2of2).(ReferstoDiagramNo:
4.)
UsethefollowinglinecodestorepresenttheBinarycode1000010100000011:
(a)Bi-PolarRZ.
(b)PolarNRZ.
(c)Manchester.
(d)DifferentialManchester.
6.(Refertopage15.Signalspectrumevaluation.Book2of2).
DefinethecharacteristicsofAMIlinecodethatmakeitsuitableforPulsecodemodulation(PCM)systems.
7.(Refertopage15.Signalspectrumevaluation.Book2of2).
DefinethecharacteristicsofHDB3linecodethatmakeitsuitableforPulsecodemodulation(PCM)systems.
8.(Refertopage16.PCManaloguetodigitalconversion.Book2of2).
WithrespecttoPCManaloguetodigitalconversiondefinethefollowing:
(a)SamplingRate(relationshiptofrequencycomponentofthesignalbeingsampled.)
(b)NyquistFrequency.
9.(Refertopage18.Encoding.Book2of2).
Giventhatan10bitcodeisusedforthesamplingsize.
(a)Definethemaximumnumberofpositiveandnegativeexcursionsofthesignalamplitude.
10.(Refertopage19.Digitizationoftelephoneaudio.Book2of2).
Giventhehighestfrequencyofanaudiobasebandsignalis3KHz,thesamplingfrequencyis10KHzandthedatatobetransferredisa16bitcodewith65,536possiblecombinations.
Calculatethedatatransmissionspeedforastandardtelephone.
11.(Refertopage20.Book2of2).
Definethefollowing:
(a)QuantisingDistortion.
(b)Companding.
(c)Compressed.
(d)Expanded.
12.(Refertopage26.Examples(cabletypes).Book2of2).
Definethephysicalcharacteristicsofthefollowingcables:
(a)RG6/U.
(b)RG11/U.
(c)RG59/U.
13.(Referstopage24.Book2of2.)(ReferstoDiagramshownabove.)
Definethenameandfunctionofeachlayerofthe“CoaxCable”shownabove.
14.(Refertopage30.Connectortypes.Book2of2).
Definethetypeofconnector,commonuseandtheimpedanceoftheconnectorshownabove.
15.(Refertopage31.FConnector.Book2of2).
Withrespecttothe“F”Typeconnector,definethefollowing:
(a)Impedance
(b)Frequency
(c)Advantages
(d)Disadvantages
(e)Commonuses
16.(Refertopage30.Connectortypes.Book2of2).
Definethenameandcommonuseoftheconnectorshownabove.
17.(Refertopage33.TNCConnector.Book2of2).
Definethenameandcommonuseoftheconnectorsshownabove.
17.(Refertopage33.Motorolaconnector.Book2of2).
18.(Refertopage33.UHFconnector.Book2of2).
19.(Refertopage31.SMAconnector.Book2of2).
(a)Definethenameandcommonuseoftheconnectorshownabove.
(b)Definethephysicalcharacteristicsofthisconnector.(eg.Relativesize/construction)
(c)Definetheelectricalcharacteristicsofthisconnector.(eg.Impedance/Frequencyrange)
20.(Refertopage32.SMBconnector.Book2of2).
21.(Refertopage34.RCAconnector.Book2of2)
22.(Refertopage35.TRSconnector.Book2of2).
23.(Refertopage38.Attenuators.Book2of2).
(a)Definethenameandcommonuseofthedeviceshownabove.
(b)Definetheelectricalcharacteristicsofthisdevice.(egmaxpowerrating)
24.(Referstopage56.DMMoverallaccuracy.Book2of2).
Withrespecttothe“DigitalMultiMeter”(DMM),definethefollowing:
(a)ACaccuracy.
(b)DCaccuracy.
(c)FrequencyRange(egACmeasurements).
(d)4.5Digits.
25.(Refertopage51.Spectrumanalyser.Book2of2).
DefinethenameandfunctionperformedbyeachsectionoftheBlockdiagramshownabove.
26.(Refertopage62.Digitalstorageoscilloscope(DSO).Book2of2).
27.(Refertopage48.RFNetworkAnalyser.Book2of2).
Definethenameandfunctionsperformedbythe“TestEquipment”shownabove.
28.(Refertopage48.RFNetworkAnalyser.Book2of2).
DefinethefunctionsperformedbythefollowingRFNetworkAnalysers:
(a)ScalarNetworkAnalyser(SNA).
(b)VectorNetworkAnalyser(VNA)
(c)LargeSignalNetworkAnalyser(LSNA)
29.(Refertopage50.RFSpectrumAnalyser.Book2of2).
DefinethefunctionsperformedbyaRadioFrequencySpectrumAnalyser.
FORMULAESHEET.
BitRate.
BitRate=SamplespersecxNumberofbitspersamplex2(fortwochannels(stereo))
DataTransmissionSpeed.
DataTransmissionSpeed=NumberofbitspersamplexSampleRate.
NyquistRate.
NyquistRate(minimum)=2xhighestfrequencycomponentofanaudiosignal.
%Throughput
=(NumberofDatabits÷
Totalnumberofbitstransmittedpercharacter)×
100
%Throughput=(Data÷
(Data+Startbit+Paritybit(ifused)+Stopbit/s))×
Shannon’sLaw
Shannon’sLaw=3.32xBWxlog10(1+S/N)bps
Where:
bpsisthemaximumtransferspeedinbitspersecond
BWisthebandwidthofthechannelinHz(Hertz)
Sisthepowerofthesignal
Nisthepowerofthenoiseonthechannel
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