Menu Close

Connection to the ISS

Frequencies currently in use

(Info with many thanks from

The following frequencies are currently used for amateur radio ISS contacts (QSOs):

  • Voice and SSTV downlink: 145.80 (worldwide)
  • Language uplink: 144.49 for ITU Regions 2 and 3 (Americas, Pacific, and South Asia)
  • Language uplink: 145.20 for ITU Region 1 (Europe, Russia and Africa)
  • FM packet uplink and downlink: 145,825 (worldwide)
  • UHF packet uplink and downlink: 437,550
  • VHF/UHF repeater uplink: 145.99 (PL 67 Hz)
  • VHF/UHF repeater downlink: 437.80

A description of the ITU regions can be found on the ITU map. Most ARISS operations are frequency shared (each station uses separate receive and transmit frequencies). The downlink is the receiving frequency of the earth station. The uplink is the transmission frequency of the earth station. Earth stations can listen to the downlink frequency and transmit on the uplink frequency when the ISS is in range and crew members are in the air. Please do not broadcast on the ISS downlink frequency.

Call signs used

The following call signs are available for use on the ISS:

  • Russian: RS0ISS
  • USA: NA1SS
  • European: DP0ISS, OR4ISS, IR0ISS
  • Packet Station Mailbox: RS0ISS-11 and RS0ISS-1
  • Other call signs can be used if the station and crew change.