'ARISS lets students
worldwide experience the excitement of talking directly with crew
members of the International Space Station, inspiring them to pursue
interests in careers in science, technology, engineering and math, and
engaging them with radio science technology through amateur radio.'
Amateur Radio Facility Onboard The International Space Station (ISS)
Amateur Radio Station
ISS crew members make radio contacts during their breaks, pre-sleep time and before and after mealtime. The most common times 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 ISS amateur radios are Ericsson MP-X handheld radios, a Kenwood TM D700 and a Kenwood D710.
ISS Columbus module:
Two hand-held Ericsson (M-PA Series) transceivers.
Two hand-held Ericsson (M-PA Series) transceivers.
ISS FGB Service Module (Zarya):
The Kenwood TM-D700 radio
The ARISS Voice Downlin Frequency is 145.800 MHz (Worldwide). The ISS radio transmits signals at 145.800 MHz and receives signals at either 144.49 or 145.20 MHz, depending on its orbital location. School contacts use the 145.800 MHz downlink with unpublished uplink frequencies used ath the school site. Due to the motion of the ISS, the radio frequency must also be corrected for the Doppler shift. By doing the Doppler shift correction, the audio clarity will be maintained as clearly as possible.
Some Facts On Orbit And Dimensions Of The ISS
Source: Bright Hub
ISS & BOEING 747 Comparison
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