Maincomponentsandfunctions
| Maincomponents | Functions |
| Receiver | Itisusedtoreceive,convertandamplifytheinputsignalwithlownoise.Thereceiverconsistsofapre-amplifier,down-converter,localoscillatorandpost-amplifier.Amplifiersareusuallymadeoflow-noisefieldeffecttransistors,andusemulti-stageseriesconnectiontoachievetherequiredgain. |
| inputmultiplexer | usedtodividethesignalintomultiplechannelsaccordingtofrequencyband,eachchannelpassesBandpassfilterandequalizercanbeadjustedindependently. |
| Driveamplifier | ismadeofmulti-stagetransistors.Usedtoamplifythesignalsentbythereceivertoobtainacertaingainandpowertoexcitethefinalpoweramplifier. |
| Poweramplifier | Usingtravelingwavetubeamplifierorsolid-statepoweramplifiertoamplifyeachcommunicationsignaltoThespecifiedpowerlevel. |
| Outputmultiplexer | ItspurposeistoreduceorfilteroutharmfulfrequenciesgeneratedinthetransponderComponent,andcombinethesignalsofeachchanneltofeedthetransmittingantenna.Themaintechnicalindicatorsofthetransponderare:gain(thatis,theamountofpoweramplification),amplitude-frequencycharacteristics,maximumoutputpower,noisefigure,intermodulationlevel,amplitudemodulationandphasemodulationconversioncoefficientandtimedelayvariationwithfrequency. |
Demonstrationpicture
Communicationrepeater
