Freq (MHz) | Satellite | Payload | Signal Type | Notes |
121.750 | Soyuz TMA-1 | ISS Crew transport | Medium bandwidth FM voice | Frequency used during on-orbit operations to and from the Space Station, and reportedly used for recovery beacon during landing module descent - Also transmits at 166 MHz and 922.763 MHz |
130.167 | ISS | Space Station | Medium bandwidth FM voice | VHF-2 channel used as an alternative to VHF-1 (143.625 MHz) during Shuttle/ISS on-orbit operations |
130.167 | ISS | Space Station | Ranging pulses | Used by TORU remote control docking system, usually tested 1-2 days before a Progress docking is due, the Progress return path is at 121.750 MHz |
143.625 | ISS | Space Station | Medium bandwidth FM voice | VHF-1 channel, also used to relay Mission Control to the Shuttle - used as part of the ISS Early Communications System over the USA working with the Wallops Facility and White Sands, detected carrying packet data transmissions during Expedition 1 |
145.800 | ISS | Space Station | Amateur Radio downlink frequency | Amateur radio downlink - see NASA's ARISS Page |
145.825 | ISS | Space Station | Amateur Radio downlink frequency | Amateur radio downlink - see NASA's ARISS Page |
145.990 | Suitsat | Amateur radio experiment - life expired Orlan spacesuit equipped with a radio transmitter and released from ISS during a crew EVA | NFM - extremely weak | Voice recording + SSTV image - the low power was due to a failed amplifier - Released from ISS 2006 Feb 3 and battery exhausted 2006 Feb 18 |
166.000 | Soyuz TMA-1 | ISS Crew transport | FM telemetry - sidebands at +/- 128 kHz | Transmits during on-orbit operations to and from the ISS, and while docked with the space station - The transmission sounds as a loud buzz with sharp peaks at the sideband frequencies - Also transmits at 121.750 MHz and 922.763 MHz |
259.700 | STS | ISS Crew/payload transport | AM voice | Detected over Europe occasionally prior to Shuttle re-entry from ISS operations, and with voice during the orbital injection phase from Kennedy SC to Europe - also transmits at 2217.500 MHz |
628.000 | ISS | Space Station | FM telemetry - sidebands at +/- 128 kHz | Transmits on command from within Russia - usually in parallel with 630 MHz - Similar transmission format to Soyuz/Progress at 166 MHz but with lower power - part of the BITS telemetry system |
630.000 | ISS | Space Station | FM telemetry - sidebands at +/- 128 kHz | Transmits on command from within Russia - usually in parallel with 628 MHz - Similar transmission format to Soyuz/Progress at 166 MHz but with lower power - part of the BITS telemetry system |
632.000 | ISS | Space Station | FM telemetry - sidebands at +/- 128 kHz | Transmissions originally reported by Sven Grahn when Zarya first reached orbit - Similar transmission format to Soyuz/Progress at 166 MHz but with lower power - part of the BITS telemetry system and probably no longer in use |
634.000 | ISS | Space Station | FM telemetry - sidebands at +/- 128 kHz | Transmissions originally reported by Sven Grahn when Zarya first reached orbit - Transmits on command from Moscow, similar transmission format to Soyuz/Progress at 166 MHz but with lower power - part of the BITS telemetry system and probably no longer in use |
922.763 | Soyuz TMA-1 | ISS crew transport | CW | Part of the REGUL command and control system - there may be other elements of signals on sidebands around this frequency - transmits during the approach and departure phases from the ISS and occasionally during checks while docked - Also transmits at 121.75 MHz and 166 MHz |
2217.500 | STS | ISS Crew/payload transport | CW carrier plus side bands carrying data | Integrated voice and data on SGLS Channel 4 - transmitter operates almost continuously while the payload bay doors are open, also transmits at 259.7 MHz |