Mode

Several emission modes were used from Space Shuttle to make contacts with earth:

• Voice - Personal contacts with ham astronauts on board Space Shuttle. The QSO are done in FM, VHF band. Beside a particular mission, those are the most dificult contacts.
  
• Packet - Computer contacts using AX.25 protocol, 1200 bd speed. Thanks to W5RRR-1 Robot mode, it's possible to do several QSO each pass, and several hundrents a mission!
  
• TLM - Telemetry, using synthesized voice or packet. During SPRE it was possible the digipeat of frames using unproto mode.
  
• SSTV - Slow Scan TV. Digital mode, used to send still pictures. Each frame is decomposed in several lines and than encoded as audio tone's, using several possible modes, mostly created and denveloped by radioamateurs. On SAREX missions ROBOT 1200C mode was used.
  
• FSTV (ATV uplink) - Fast Scan TV. Similar to previous mode, but transmission speed is substancial superior. Unfortunatly this mode, as same as SSTV, wasn't used many times, mostly due equipment size and weight.

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