NASA-RP- 1080-VOL-4 NASA 19820008277 Reference :: Publication 1080 November 1981 ATS-6 Final Engineering Performance Report Volume IV - Television Experiments _._ L_ _'_. - '" L\B?'._v.-, .,\E G'_'V__ >.. _:,,_0_'_ _ • _ N/3NA NASA Reference Publication 1080 1981 ATS-6 Final Engineering PerformanceReport Volume IV - Television Experiments Robert O. Wales, Editor Goddard Space Flight Center Greenbelt, Maryland NI A National Aeronautics and Space Administration Scientific and Technical Information Branch- An EngineeringEvaluation in Six Volumes Volume I: Program and System Summaries;Mechanicaland Thermal Details Part A: Program Summaby Part B: MechanicalSubsystems Part C: Thermal COntroland Contamination Monitor Volume II: Orbit and Attitude Controls Part A: Attitude Control Part B: Pointing Experiments Part C: Spacecraft Propulsion Part D: Propulsion Experiment Volume III: Telecommunications and Power Part A: Communications Subsystem Part B: ElectricalPower Subsystem Part C: Telemetry and Command Subsystem Part D: Data Relay Experiments Volume IV: TelevisionExperiments Part A: The Department of Health,Education and WelfareSponsored Experiments Part B: Satellite Instructional TelevisionExperiment (India) Part C: Independent Television Experiments Volume V: Propagation Experiments Part A: Experiments at 1550 MHz to 1650 MHz Part B: Experiments at 4 GHz to 6 GHz Part C: Experiments Above 10 GHz Volume VI: Scientific Experiments This document makes use of international metric units according to the Syst_me International d'UnitJs (SI). In certain cases, utility requires the retention of other systems of units in addition to the SI units. The conven- tional units stated in parentheses following the computed SI equivalents are the basis of the measurements and calculations reported. For sale by the National Technical Information Service Springfield, Virginia 22161 Price ii VOLUMEIV CONTENTS Page FOREWORD.............................................................. xiii INTRODUCTION.......................................................... xix PART A DEPARTMENTOF HEALTH, EDUCATION,AND WELFARE SPONSOREDEXPERIMENTS CHAPTER 1 - HEALTH, EDUCATION, TELECOMMUNICATIONSEXPERIMENT...... 3 INTRODUCTION......................................... '............. 3 OBJECTIVES ......................................................... 3 PARTICIPANTSIN EXPERIMENT........................................ 4 THE EXPERIMENTSAND THEIR OBJECTIVES............................. 4 HET SYSTEMDESCRIPTION ............................................ 5 Functional Description .............................................. 5 Satellite Configuration .............................................. 8 Ground Terminals.................................................. 13 Uplink Facilities ................................................... 20 S-BandReceive-Only Terminals........................................ 26 LINK CONFIGURATIONSAND PERFORMANCE............................ 30 Introduction .................................................. .... 30 S-BandLinks...................................................... 30 C-BandLinks...................................................... 32 Very High Frequency Links .......................................... 32 Introduction .................................................. 32 VHF LinkConfigurations ......................................... 33 iii VOLUMEIV CONTENTS(continued) Page SYSTEM EFFECTIVENESS .............................................. 35 Introduction ................................ ...................... 35 System-Effectiveness Factor .......................................... 35 S-Band System Receive-Only Terminals ............................. 36 S-Band Transmit/Receive Terminals ................................ 39 C-Band Transmit/Receive Terminals ................................ 39 VHF Transmit/Receive Terminals ................................... 40 Four-Channel Audio Distribution System ............................ 41 Support Structure .............................................. 41 Peripheral Equipment ........................................... 43 SUMMARYAND CONCLUSIONS ......................................... 43 General .......................................................... 43 System Results ..................................................... 44 CHAPTER 2 - INDIAN HEALTH SERVICE (ALASKA) ........................... 45 INTRODUCTION ................................... ................... 45 PARTICIPANTS ....................................................... 45 IHS CONTINUATION EXPERIMENT ...................................... 47 Continuation Experiment Technical Objectives............................. 47 Continuation Experiment Sociological Objectives .......................... 47 SYSTEM DESCRIPTION ................................................. 47 General Configuration ............................................... 47 Consultation Procedure .............................................. 48 Studio Configurations ................................................ , 51 Teleconsultation Electronic Equipment-The Radio Room .................... 52 S-Band Uplink ...................................................... 52 S-Band Downlink .................................................. 56 MANAGEMENT AND CONTROL ......................................... 56 iv VOLUMEIV CONTENTS(continued) Page RESULTS ............................................................ 57 CHAPTER 3 - APPALACHIANEDUCATION SATELLITEPROJECT ................ 59 INTRODUCTION....................................................... 59 BACKGROUND ....................................................... 59 Area and Population To Be Served ..................................... 59 History of the Appalachian Education Satellite Project...................... 61 OPERATIONS ........................................................ 63 Appalachian Education Satellite Project-1974 ............................ 63 Organization .................................................. 63 Identification of Initial (1974) AESP Sites and System.................. 63 Appalachian Education Satellite Project- 1975 to 1979. .................... 68 Delivery Remote/Network Changes................................. 69 1976 to 1979 Accomplishments ..................................... 70 CHAPTER4 - THE UNIVERSITY OF WESTINDIES EXPERIMENT................. 71 INTRODUCTION...................................................... 71 PARTICIPANTS....................................................... 73 EXPERIMENTOBJECTIVES............................................. 73 Technical Objectives ................................................ 73 Socio-Economic Objectives ........................................... 73 SYSTEM DESCRIPTION ................................................ 73 S-Band Uplink ..................................................... 74 S-Band Transponder ................................................ 78 ATS-3 Uplink and Downlink .......................................... 78 VOLUMEIV CONTENTS (continued) • Page MANAGEMENTAND CONTROL......................................... 81 RESULTS............................................................ 81 PART B SATELLITEINSTRUCTIONALTELEVISIONEXPERIMENT(INDIA) CHAPTER5 - SATELLITE INSTRUCTIONALTELEVISION EXPERIMENT(INDIA)... 89 INTRODUCTION........................................................ 89 TECHNICALOBJECTIVESOF THE EXPERIMENT........................... 89 TECHNICALDESCRIPTION............................................. 91 System Overview................................ ................... 91 Direct Reception System............................................. 91 Baseband..................................................... 94 Modulation ................................................... 94 Uplink Stations .................................................... 94 Ahmedabad Earth Station ........................................ 94 Delhi Earth Station ............................................. 96 System Performance................................................ 96 Reliability .................................................... 96 Availability ................................................... 96 LinkPerformance .............................................. 96 CHAPTER6 - THE GALLOWAYREPORT SATELLITEINSTRUCTIONALTELEVISIONEXPERIMENT(INDIA)................ 99 NASA REPRESENTATIVEREPORT ...................................... 99 BIBLIOGRAPHY-SATELLITEINSTRUCTIONALTELEVISION EXPERIMENT(INDIA) ..................................................... 103 vi VOLUME IV CONTENTS (continued) Page PART C INDEPENDENT TELEVISION EXPERIMENTS CHAPTER 7 - AIDSAT ...................................................... 109 SUMMARY............................................................ 109 BACKGROUND ............................ ............................ 109 OPERATIONS ........................................................ 113 Phase I AIDSAT ...... .............. ............................... 113 Phase II AIDSAT ................................................... 115 ACCOMPLISHMENTS ................................................... 118 CHAPTER 8 - PROJECT LOOK UP ............................................ 121 INTRODUCTION ...................................................... 121 Background ....................................................... 121 Goals ........... .................................. .............. 121 Objectives ...................... ................................. 122 CONCEPT OF EXPERIMENT