ISS (ZARYA)
NORAD 25544 Active APRS Digipeater
Frequencies
| Purpose | Frequency | Mode |
|---|---|---|
| APRS Digipeater | 145.825 MHz | FM 1200bps |
| Voice Downlink | 437.800 MHz | FM |
| Voice Uplink | 145.990 MHz | FM |
About ISS (ZARYA)
The International Space Station carries amateur radio equipment as part of the ARISS program. It operates an APRS digipeater on 145.825 MHz, allowing hams to have their packets relayed through space. The ISS also supports scheduled voice contacts with schools and occasional SSTV transmissions.
Operator ARISS (Amateur Radio on the International Space Station)
Altitude ~408 km
Inclination 51.6°
Period ~92 minutes
How to Work ISS (ZARYA)
To work the ISS APRS digipeater, transmit APRS packets on 145.825 MHz with the path ARISS or RS0ISS. A handheld radio with 5W and a good antenna is sufficient. The ISS passes overhead for 5-10 minutes at a time, so timing is critical. Use this tracker to predict passes and tune your radio with Doppler correction.
Tips
- - Use a directional antenna (Yagi or Arrow) for best results
- - The ISS moves fast — Doppler shift is significant on 70cm
- - APRS on 2m has minimal Doppler, making it the easiest mode
- - Check for scheduled school contacts on ariss.org before transmitting voice
Next 24 Hours — Pass Predictions
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