Contact the ISS

Some ISS crew members make random, unscheduled, amateur radio voice contacts with earth-bound radio amateurs, often called “hams”. They can make radio contacts during their breaks, pre-sleep time and before and after mealtime. Astronauts have contacted thousands of hams around the world. The work schedules of the ISS crew dictate when they are able to operate the radios. The crew’s usual waking period is 0730 – 1930 UTC. The most common times to find a crew member making casual periods are about one hour after waking and before sleeping, when they have personal time. They’re usually free most of the weekend, as well.

The following frequencies are currently used for Amateur Radio ISS contacts:  

  •  Voice and SSTV Downlink: 145.80 (Worldwide)
  • Voice Uplink: 144.49 for ITU Regions 2 and 3
    • (The Americas, and the Pacific and Southern Asia)
  • Voice Uplink: 145.20 for ITU Region 1
    • (Europe, Russia and Africa)
  • VHF 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


66800cookie-checkContact the ISS