‰  NOW 13 WPM  ‰  TEXT IS FROM FEBRUARY 2017 QST PAGE 76  ‰

TWO ARDUINOS ACT AS SERVERS.  INFORMATION STREAMS IN REAL TIME FROM THE
PROBE DURING FLIGHT, AND THE STUDENTS ARE ABLE TO MAINTAIN TELEMETRY WITH
THE SPACE PROBE BY TRANSMITTING AND RECEIVING DATA THROUGH TWO 2R39 GHZ
MICROWAVE RADIOS.  THE GROUND BASED ANTENNA, SHOWN IN FIGURE 3, IS A HIGH
GAIN PARABOLIC DISH CONTROLLED BY TWO STEPPER MOTORS.  THE POSITION OF THE
ANTENNA IS MONITORED BY A 9 AXIS INERTIAL MEASUREMENT SYSTEM ATTACHED TO
THE PARABOLIC ANTENNA.  THE 9 AXIS SENSOR SYSTEM REPORTS THE ACTUAL HEADING
ƒ  QST DE W1AW  ‰
AND ELEVATION OF THE PARABOLIC DISH.  THE PROBE OBTAINS GPS DATA AND
TRANSMITS THE LATITUDE, LONGITUDE, AND ALTITUDE OF THE PROBE BACK TO
MICROCONTROLLERS CONNECTED TO THE ANTENNA SYSTEM.  THE REQUIRED HEADING AND
ELEVATION FOR THE ANTENNA IS CALCULATED THROUGH THE COMPLICATED HAVERSINE
FORMULA, BUT THE ACTUAL HEADING AND ELEVATION IS DETERMINED FROM THE 9 AXIS
SENSOR MOUNTED TO THE ANTENNA.  THE DESIRED HEADING AND ELEVATION ARE
‰  END OF 13 WPM TEXT  ‰  QST DE W1AW  ƒ