QB50 precursor

Welcome to the amateur radio operator page


This mission is comprised of two satellites: QB50p1 and QB50p2

After deployment from the Quadpack, the satellite will be transmitting its CW beacon.

Contact information / reception reports

To get in touch with the operations team, please use the following e-mail address: operations@isispace.nl

We would appreciate to receive reception reports or recordings of the downlink signal, please include the following information in your report:

  • Name and callsign
  • Location or Maidenhead gridsquare locator
  • Date and time of reception (UTC)
  • Frequency at which you have received a QB50 precursor satellite
  • Which of the two satellite you think you have heard
  • Satellite transmission mode (indicate whether you have received a CW beacon or AX.25 beacon or both)

We will also be present in the #cubesat channel on the Freenode IRC network (irc.freenode.net)

To upload data received from either satellite, please go to upload.qb50.eu. For any questions regarding this upload page please contact scholz@vki.ac.be.

Satellite downlink overview

  • QB50p1 downlink frequency: 145.815 MHz
  • QB50p2 downlink frequency: 145.880 MHz
  • Satellite antenna polarization: linear

CW / Morse beacon

  • Modulation: CW / Morse code
  • Speed: 15 words per minute
  • Beacon interval: 45 seconds
  • Beacon length: approx. 12 seconds
CW beacon content

Q P ID X X X X X X X X Y Y
  • ID: character to determine satellite ID
  • X: character in the range A-Z
  • Y: character in the range A-Z or number in the range 0-9

You can use the CW beacon content decoder to translate the CW beacon characters to engineering values.

AX.25 beacon

  • Modulation: Binary Phase Shift Keying (BPSK)
  • Nominal data rate: 1200 bps (2400bps, 4800bps, 9600bps are possible upon ground command)
  • Protocol: AX.25 UI frames
  • Enoding: NRZI
  • Beacon interval: 10 seconds
  • QB50p1 AX.25 callsigns:
    • FROM: QB50P1-0
    • TO: QB50P1-0
  • QB50p2 AX.25 callsigns:
    • FROM: QB50P2-0
    • TO: QB50P2-0

You can use the AX.25 beacon content decoder to translate the nominal mode beacon content to engineering values. Please note that the a beacon consists of two AX.25 frames, both of which are defined in the content decoder.

Transponder information

The transponders will be activated after main mission completion

QB50p1

QB50p1 carries the FUNcube-3 400 mW inverting linear 435/145 MHz transponder provided by AMSAT-NL with support from AMSAT-UK.

  • Uplink: 435.035-435.065 MHz LSB
  • Downlink: 145.935-145.965 MHz USB

QB50p2

QB50p2 carries a 435/145 MHz FM transponder and FX25 data transmitter from AMSAT-Francophone.

  • Uplink: To be announced
  • Downlink: 145.840 MHz 9600 bps FSK FX25

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