Frequenze Operative                 Stazione Spaziale ISS Zarya


FM VOICE for ITU Region 1: Europe-Middle East-Africa-North Asia
Downlink 145.800 
Uplink 145.200 

FM VOICE for ITU Region 2&3: North and South America-Caribbean-Greenland-Australia-South Asia
Downlink 145.800 
Uplink 144.490 

FM VOICE Repeater (Worldwide) 
Downlink 145.800 
Uplink 437.800 
AX.25 1200 Bd AFSK Packet Radio (Worldwide)
Downlink 145.825 
Uplink 145.825 
UHF Simplex (rarely used)
Downlink 437.550 
Uplink 437.550 

Other Frequencies:

121.75 FM 
Voice downlink from Soyuz-TM during free flight operations, the frequency also carries ranging information from the TORU
remote control docking system, and carries a recovery beacon signal during Soyuz descent (detectable over near-east and south- west Asia) 

130.167 AM 
VHF-2 downlink from Zarya - carries voice (Russian and English) plus packet data, sometimes instead of VHF-1 (during shuttle- docked
periods) and sometimes in parallel with VHF-

143.625 FM 
VHF-1 downlink, the main Russian comms channel - content similar to VHF-2 - works with Russian ground stations plus White Sands
AFB, Dryden Flight Center and Wallops Island in the US 

166.000 AM 
Telemetry during orbital operations of Soyuz-TM and Progress M-1 vehicles, also occasional transmissions from ISS
- probably from a docked Soyuz or Progress ferry, it can be heard as a buzz with two distinct peaks at 166.125 and 165.875 MHz 

259.700 AM 
Voice from Space Shuttle during ascent and descent - reported as detectable over east coast US then from Europe about 20 minutes
after lift-off, generally silent at other times but has been detected over Europe on the descent orbit 

632.000 634.000 AM 
Telemetry from Zarya module, similar to the 166 MHz transmission with peaks at +/- 125 kHz - transmissions not very frequent and
seem to be confined to 634 MHz - most likely on passes over eastern Europe - watch out for the Doppler shift at this frequency
- it can make the signal appear up to 15 kHz off-frequency 

628.000 630.000 AM 
Telemetry from Zvezda module, transmissions are similar to, and more frequent than those from Zarya and are on command from Moscow
- the two transmitters appear to operate in parallel 

922.76 CW 
Beacon from Soyuz-TM and Progress M1 and from the Russian ISS modules - tends to be received in parallel with the 166 MHz or
620-630 MHz transmissions, beware of the Doppler, it ranges +/- 23 kHz from the centre frequency 

2265.0 Digital 
S-Band Single Access Telementry Downlink 

15003.4 Digital 
Ku-Band Single Access Downlink. Used for video and large file tranfers.