Section

     3.7  NEW DATA SYSTEM  . . . . . . . . . . . . . . . . . . 3-29
          3.7.1  Computer Complex  . . . . . . . . . . . . . . 3-31
          3.7.2  Computer Interface Equipment  . . . . . . . . 3-33
          3.7.3  Control and Display Equipment . . . . . . . . 3-35 
     3.8  COMSEC EQUIMENT  . . . . . . . . . . . . . . . . . . 3-45
     3.9  PCM TELEMETRY DATA EQUIPMENT . . . . . . . . . . . . 3-47
          3.9.1  Signal Switching Facility . . . . . . . . . . 3-47
          3.9.2  SGLS/Non SGLS Switch Unit . . . . . . . . . . 3-53
          3.9.3  Recording/Playback Equipment  . . . . . . . . 3-53
          3.9.4  PCM Telemetry Ground Station  . . . . . . . . 3-53
     3.10  FM/FM TELEMETRY GROUND STATION  . . . . . . . . . . 3-54
         3.10.1  Telemetry RF Equipment  . . . . . . . . . . . 3-55
         3.10.2  Telemetry Discriminating Equipment. . . . . . 3-59
         3.10.3  Telemetry Decommutation Equipment . . . . . . 3-59
         3.10.4  Patching Swithching Equipment . . . . . . . . 3-59
         3.10.5  Monitor Display equipment . . . . . . . . . . 3-59                                
         3.10.6  Ancillary Equipment . . . . . . . . . . . . . 3-59
         3.10.7  Magnetic Tape Recorder/Reproducer Equipment . 3-61
     3.11  NON SGLS S-BAND EQUIPMENT . . . . . . . . . . . . . 3-61
     3.12  ECHO CHECK RECORDING EQUIPMENT  . . . . . . . . . . 3-61
     3.13  TIMING SUBSYSTEM  . . . . . . . . . . . . . . . . . 3-61         
         3.13.1  Operating Modes . . . . . . . . . . . . . . . 3-61
         3.13.2  Master Timing Assembly  . . . . . . . . . . . 3-63
         3.13.3  Remote Time Distribution Equipment  . . . . . 3-65
         3.13.4  Display Equipment . . . . . . . . . . . . . . 3-65
         3.13.5  Subsystem Interfaces  . . . . . . . . . . . . 3-67
     3.14  INTERSTATION COMMUNICATIONS EQUIPMENT . . . . . . . 3-67         
     3.15  INTRASTATION COMMUNICATIONS EQUIPMENT . . . . . . . 3-67

                          SECTION 4 SYSTEM PERFORMANCE
     4.1  DOWNLINK ANALYSIS  . . . . . . . . . . . . . . . . . 4-3
          4.1.1  Received Signal Power  . . . . . . . . . . . . 4-5
          4.1.2  Signal Power at Antenna terminals  . . . . . . 4-5     
          4.1.3  Signal Power at Preamplifier input . . . . . . 4-6
          4.1.4  System Noise Temperature . . . . . . . . . . . 4-6
          4.1.5  Figure of Merit  . . . . . . . . . . . . . . . 4-7
          4.1.6  Threshold Level  . . . . . . . . . . . . . . . 4-8
          4.1.7  System Service Margin  . . . . . . . . . . . . 4-8 
     4.2  ACQUISITION   . . . . . . . . . . . . . . . . . . . . 4-11 
          4.2.1  The Acquisition Problem  . . . . . . . . . . . 4-13
          4.2.2  Acquisition Probability  . . . . . . . . . . . 4-13
          4.2.3  Orbital Characteristics  . . . . . . . . . . . 4-15
          4.2.4  Equipment Performance  . . . . . . . . . . . . 4-15
          4.2.5  Determination of Acquisition Probability . . . 4-21/4-22
          4.2.6  200 MHz Autotracker Antenna  . . . . . . . . . 4-21/4-22
     4.3  SIGNAL LOSS AT ACQUISITION  . . . . . . . . . . . . . 4-23
          4.3.1  Tracking Data Requirements . . . . . . . . . . 4-25  
          4.3.2  Az El Keyhole Profile  . . . . . . . . . . . . 4-25
          4.3.3  Key Hole Exit (Reacquisition)  . . . . . . . . 4-29/4-30  

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