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WHAT IS TIMS ?TIMS is a Telecommunications Instructional Modelling System. It modelstelecommunication systems.Text books on telecommunications abound with block diagrams. Thesediagrams illustrate the subject being discussed by the author. Generally theyare small sub-systems of a larger system. Their behaviour is described by theauthor with the help of mathematical equations, and with drawings orphotographs of the signal waveforms expected to be present.TIMS brings alive the block diagram of the text book with a working model, recreating the waveforms on an oscilloscope.How can TIMS be expected to accommodate such a large number ofmodels ?There may be hundreds of block diagrams in a text book, but only a relativelyfew individual block types. These block diagrams achieve their individualitybecause of the many ways a relatively few element types can be connected indifferent combinations.TIMS contains a collection of these block types, or modules, and there arevery few block diagrams which it cannot model. PURPOSE OF TIMSTIMS can support courses in Telecommunications at all levels - fromTechnical Colleges through to graduate degree courses at Universities.This text is directed towards using TIMS as support for a course given atany level of teaching.Most early experiments are concerned with illustrating a small part of alarger system. Two or more of these sub-systems can be combined to buildup a larger system.The list of possible experiments is limitless. Each instructor will have his orher own favourite collection - some of them are sure to be found herein.Naturally, for a full appreciation of the phenomena being investigated, thereis no limit to the depth of mathematical analysis that can be undertaken. Butmost experiments can be performed successfully with little or nomathematical support. It is up to the instructor to decide the level ofunderstanding that is required.
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EXPERIMENT AIMSThe experiments in this Volume are concerned with introductory analogcommunications. Most of them require only the TIMS basic set ofmodules.The experiments have been written with the idea that each modelexamined could eventually become part of a larger telecommunicationssystem, the aim of this large system being to transmit a message frominput to output. The origin of this message, for the analog experiments inVolumes A1 and A2, would ultimately be speech. But for test andmeasurement purposes a sine wave, or perhaps two sinewaves (as in thetwo-tone test signal) are generally substituted. For the digital experiments(Volumes D1, D2 and D3) the typical message is a pseudo random binarysequence.The experiments are designed to be completed in about two hours, withsay one hour of preparation prior to the laboratory session.The five Volumes of Communication Systems Modelling with TIMSare:A1 - Fundamental Analog ExperimentsA2 - Further & Advanced Analog ExperimentsD1 - Fundamental Digital ExperimentsD2 - Further & Advanced Digital ExperimentsD3 – Advanced Digital ExperimentsAlso available as an optional extra is:TCLM1 – Technical College Lab Manual
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ContentsIntroduction to modelling with TIMS ..........................................A1-01Modelling an equation.................................................................A1-02DSBSC generation......................................................................A1-03Amplitude modulation.................................................................A1-04Envelopes ...................................................................................A1-05Envelope recovery.......................................................................A1-06SSB generation - the phasing method ..........................................A1-07Product demodulation - synch. & asynchronous ..........................A1-08SSB demodulation - the phasing method .....................................A1-09The sampling theorem .................................................................A1-10PAM & time division multiplex ...................................................A1-11Power measurements...................................................................A1-12Appendix A - Filter responses .....................................................A1Appendix B - Some Useful Expansions........................................ B1
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