QO-100 High Speed Multi Media Beacon

QO-100 High Speed Multi Media Beacon

May 30, 2022 Off By Peter Gülzow

The new “AMSAT-DL Highspeed Multimedia Modem” developed by Kurt DJ0ABR for the QO-100 NB transponder allows a transmission speed of up to 7200 bit/s in 8 APSK or 4800 bit/s in QPSK despite the maximum allowed bandwidth of 2.7 kHz.

It is thus significantly more efficient than conventional methods on the QO-100 transponder and it can be used to transmit any data and voice in full duplex. The software is open source and available free of charge.

Since the end of May 2022, the MM beacon from the QO-100 ground station (DK0SB) in Bochum is active.


  • Center frequency: 10,489,995 MHz
  • Zero beat, SSB: 10,489,993.3 MHz
  • Modulation: 8 APSK
  • Symbol rate: 7200 bit/s
  • HF bandwidth: 2700 Hz


different types of multimedia content are already available or planned.

  • Narrow Band Transponder Activity
  • Wide Band Transponder Activity
  • DX Cluster Messages
  • CW Skimmer
  • AMSAT Bulletins
  • APRS (planned)




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