International Space Station (ISS) Frequencies

The ISS utilizes various frequencies for communication and data transmission. Here's a breakdown of the publicly accessible Amateur Radio frequencies relevant to enthusiasts:

• Frequency Bands:

  • Uplink (Earth to ISS):

    • Primary: 145.800 MHz (2 meters)

    • Secondary: 437.800 MHz (70 centimeters)

  • Downlink (ISS to Earth):

    • Primary: 145.200 MHz (2 meters)

    • Secondary: 437.500 MHz (70 centimeters)

• Band Types: These frequencies fall under the Very High Frequency (VHF) and Ultra High Frequency (UHF) bands of the radio spectrum.

• Bandwidth:

  • Voice communication typically uses a narrow bandwidth around 2.5 kHz.

• Uses:

  • These frequencies are designated for communication between astronauts aboard the ISS and licensed Amateur Radio (ham radio) operators on Earth.

  • During designated contact periods, astronauts may conduct educational discussions with students, participate in public outreach events, or engage in casual conversations with ham radio enthusiasts.

Important Notes:

• Transmitting on these frequencies requires a valid Amateur Radio license issued by the regulatory body in your region (e.g., FCC in the US).

• Reception of these frequencies is open to anyone with a suitable receiver.

Additional Resources:

• ARISS (Amateur Radio on the International Space Station): https://www.ariss.org/about-ariss-contacts.html ([ARISS website]) provides detailed information about the ham radio program on the ISS, including licensing requirements and operating procedures.