====== Requirements / use cases ======

===== Receive Data =====

For measurement (timing critical)
  * ADSB
  * OSCAR
  * Weather sat

For Position / Time synchronisation
  * GPS
  * Galileo
  * DCF77
  * Glnoass

For Data Transfer (fast is good)
  * HAMNET
  * USB

===== Send Data =====

  * OSCAR
  * HAMNET
  * USB


===== Environmental Sensors (not very timing critical) =====

A few seconds later or earlier is not a problem

  * Radiation
  * Temperature
  * ...

===== Sattelite and Airplane Tracking =====

  * OSCAR & others
  * ADS-B


===== Special use cases (implicitly) =====
  * Packet Radio Receiver
  * Packet Radio Relay
  * Packet Radio Search