射频复习材料2.docx

射频复习材料2.docx

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射频复习材料2

Electrical,Electronics

EngineeringDepartment

StudentNumber:

______________________

Name:

_______________________________

UEENEEH076C.RFTechnology2.Bank

Multi-Choice.

forStudentRevision.

QuestionNo:

1.（Refertopage8HarmonicsBook2of2）.

Withrespecttothe“NatureofDigitalSignals”definethefollowing:

（a）Fundamentalfrequency.

（b）OddHarmonicfrequencies.

（c）EvenHarmonicfrequencies.

（d）Resultantfrequency.

QuestionNo:

2.（Refertopage9.DigitalSignals.Book2of2）.

Definethecharacteristicsof“Pulsecodedmodulationsystems”.

（eg.TherelationshipbetweenTransmissionSpeedandDistance）

QuestionNo:

3.（Refertopage11.Digitalsignals&transmissionmediums.Book2of2）.

Withreferencetothediagramabovedeterminethefollowing:

（a）Thetypeof“LineCode”represented.

（b）Thebinarydatarepresented.

QuestionNo:

4.（Refertopage13.Someofthecodesavailable.Book2of2）.

Withreferencetothediagramabovedeterminethefollowing:

（a）Thetypeof“LineCodes”represented.

（b）Thebinarydatarepresented.

（c）Theadvantages/disadvantagesofeachcode.

QuestionNo:

5.（Refertopage13.Someofthecodesavailable.Book2of2）.（ReferstoDiagramNo:

4.）

UsethefollowinglinecodestorepresenttheBinarycode1000010100000011:

（a）Bi-PolarRZ.

（b）PolarNRZ.

（c）Manchester.

（d）DifferentialManchester.

QuestionNo:

6.（Refertopage15.Signalspectrumevaluation.Book2of2）.

DefinethecharacteristicsofAMIlinecodethatmakeitsuitableforPulsecodemodulation（PCM）systems.

QuestionNo:

7.（Refertopage15.Signalspectrumevaluation.Book2of2）.

DefinethecharacteristicsofHDB3linecodethatmakeitsuitableforPulsecodemodulation（PCM）systems.

QuestionNo:

8.（Refertopage16.PCManaloguetodigitalconversion.Book2of2）.

WithrespecttoPCManaloguetodigitalconversiondefinethefollowing:

（a）SamplingRate（relationshiptofrequencycomponentofthesignalbeingsampled.）

（b）NyquistFrequency.

QuestionNo:

9.（Refertopage18.Encoding.Book2of2）.

Giventhatan10bitcodeisusedforthesamplingsize.

（a）Definethemaximumnumberofpositiveandnegativeexcursionsofthesignalamplitude.

QuestionNo:

10.（Refertopage19.Digitizationoftelephoneaudio.Book2of2）.

Giventhehighestfrequencyofanaudiobasebandsignalis3KHz,thesamplingfrequencyis10KHzandthedatatobetransferredisa16bitcodewith65,536possiblecombinations.

Calculatethedatatransmissionspeedforastandardtelephone.

QuestionNo:

11.（Refertopage20.Book2of2）.

Definethefollowing:

（a）QuantisingDistortion.

（b）Companding.

（c）Compressed.

（d）Expanded.

QuestionNo:

12.（Refertopage26.Examples（cabletypes）.Book2of2）.

Definethephysicalcharacteristicsofthefollowingcables:

（a）RG6/U.

（b）RG11/U.

（c）RG59/U.

QuestionNo:

13.（Referstopage24.Book2of2.）（ReferstoDiagramshownabove.）

Definethenameandfunctionofeachlayerofthe“CoaxCable”shownabove.

QuestionNo:

14.（Refertopage30.Connectortypes.Book2of2）.

Definethetypeofconnector,commonuseandtheimpedanceoftheconnectorshownabove.

QuestionNo:

15.（Refertopage31.FConnector.Book2of2）.

Withrespecttothe“F”Typeconnector,definethefollowing:

（a）Impedance

（b）Frequency

（c）Advantages

（d）Disadvantages

（e）Commonuses

QuestionNo:

16.（Refertopage30.Connectortypes.Book2of2）.

Definethenameandcommonuseoftheconnectorshownabove.

QuestionNo:

17.（Refertopage33.TNCConnector.Book2of2）.

Definethenameandcommonuseoftheconnectorsshownabove.

QuestionNo:

17.（Refertopage33.Motorolaconnector.Book2of2）.

Definethenameandcommonuseoftheconnectorshownabove.

QuestionNo:

18.（Refertopage33.UHFconnector.Book2of2）.

Definethenameandcommonuseoftheconnectorshownabove.

QuestionNo:

19.（Refertopage31.SMAconnector.Book2of2）.

（a）Definethenameandcommonuseoftheconnectorshownabove.

（b）Definethephysicalcharacteristicsofthisconnector.（eg.Relativesize/construction）

（c）Definetheelectricalcharacteristicsofthisconnector.（eg.Impedance/Frequencyrange）

QuestionNo:

20.（Refertopage32.SMBconnector.Book2of2）.

（a）Definethenameandcommonuseoftheconnectorshownabove.

（b）Definethephysicalcharacteristicsofthisconnector.（eg.Relativesize/construction）

（c）Definetheelectricalcharacteristicsofthisconnector.（eg.Impedance/Frequencyrange）

QuestionNo:

21.（Refertopage34.RCAconnector.Book2of2）

Definethenameandcommonuseoftheconnectorsshownabove.

QuestionNo:

22.（Refertopage35.TRSconnector.Book2of2）.

Definethenameandcommonuseoftheconnectorsshownabove.

QuestionNo:

23.（Refertopage38.Attenuators.Book2of2）.

（a）Definethenameandcommonuseofthedeviceshownabove.

（b）Definetheelectricalcharacteristicsofthisdevice.（egmaxpowerrating）

QuestionNo:

24.（Referstopage56.DMMoverallaccuracy.Book2of2）.

Withrespecttothe“DigitalMultiMeter”（DMM）,definethefollowing:

（a）ACaccuracy.

（b）DCaccuracy.

（c）FrequencyRange（egACmeasurements）.

（d）4.5Digits.

QuestionNo:

25.（Refertopage51.Spectrumanalyser.Book2of2）.

DefinethenameandfunctionperformedbyeachsectionoftheBlockdiagramshownabove.

QuestionNo:

26.（Refertopage62.Digitalstorageoscilloscope（DSO）.Book2of2）.

DefinethenameandfunctionperformedbyeachsectionoftheBlockdiagramshownabove.

QuestionNo:

27.（Refertopage48.RFNetworkAnalyser.Book2of2）.

Definethenameandfunctionsperformedbythe“TestEquipment”shownabove.

QuestionNo:

28.（Refertopage48.RFNetworkAnalyser.Book2of2）.

DefinethefunctionsperformedbythefollowingRFNetworkAnalysers:

（a）ScalarNetworkAnalyser（SNA）.

（b）VectorNetworkAnalyser（VNA）

（c）LargeSignalNetworkAnalyser（LSNA）

QuestionNo:

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））×100

Shannon’sLaw

Shannon’sLaw=3.32xBWxlog10（1+S/N）bps

Where:

bpsisthemaximumtransferspeedinbitspersecond

BWisthebandwidthofthechannelinHz（Hertz）

Sisthepowerofthesignal

Nisthepowerofthenoiseonthechannel