ISIS Triton-1

Welcome to the amateur radio operator page

Please note that the November 21st ISILaunch03 DNEPR launch carries the Triton-1 satellite, but not the Triton-2 satellite. The launch date for the Triton-2 is still to be determined at this moment

After deployment from the ISIPOD, the satellite will be operating in safe mode.

The Triton-1 satellite carries two redundant TRXUV UHF/VHF transceivers, labeled TRXUV-0 and TRXUV-1.

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 Triton-1
  • Satellite 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)

Satellite downlink overview

  • TRXUV-0 downlink frequency: 145.815 MHz
  • TRXUV-1 downlink frequency: 145.860 MHz
  • Satellite antenna polarization: linear

Safe mode beacon (CW / Morse)

  • Radio: alternating every two beacons between TRXUV-0 and TRXUV-1
  • Modulation: CW / Morse code
  • Speed: 15 words per minute
  • Beacon interval: 30 seconds
  • Beacon length: approx. 10 seconds
Safe mode beacon content
T 1 X X X X X X Y Y
  • 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 Safe mode beacon content decoder to translate the CW beacon characters to engineering values.

Nominal mode beacon (AX.25)

  • Radio: TRXUV-0 or TRXUV-1 (only one of these will be active, no alternation). Radio selection is upon ground command.
  • 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
  • TRXUV-0 callsigns:
    • FROM: TRIV0 -0
    • TO: TRIV0 -0
  • TRXUV-1 callsigns:
    • FROM: TRIV1 -0
    • TO: TRIV1 -0

You can use the AX.25 beacon content decoder to translate the nominal mode beacon content to engineering values.

End of Life Transponder

  • Radio: TRXUV-0
  • Transponder downlink frequency: 145.815 MHz
  • Downlink modulation: Double Side Band
  • Transponder uplink frequency: in 435-438MHz band, exact frequency to be announced at beginning of transponder operations
  • Uplink modulation: Narrow Band Frequency Modulation, max 3.5kHz deviation