What is the ISS uplink frequency?

ISS listens on 145.990 MHz (FM), 437.825 MHz (AFSK 1k2), 145.825 MHz (AFSK 1k2), 144.490 MHz (FM) and 145.200 MHz (FM).

What is the ISS downlink frequency?

ISS transmits on 437.800 MHz (FM), 437.825 MHz (AFSK 1k2), 145.825 MHz (AFSK 1k2), 145.800 MHz (FM), 145.800 MHz (FM), 437.800 MHz (FSK 9k6), 437.800 MHz (SSTV), 145.800 MHz (SSTV), 437.550 MHz (SSTV), 435.400 MHz (FM), 2425.000 MHz (FM), 2375.000 MHz (FM) and 2395.000 MHz (DVB-S2).

When does ISS pass over my location?

Open ISS on the live map and enter your Maidenhead locator or use GPS: the tracker lists the passes of the next 24 hours with AOS, maximum elevation and LOS, and shifts the frequencies for Doppler.

ISS (ZARYA): Frequencies, Status & Passes

Next passes over your station

Pass times depend on where you are. Track ISS on the live map to see its next passes over your station.

ISS frequencies

Uplink	Downlink	Beacon	Mode
145.990 MHz	437.800 MHz	—	FM
437.825 MHz	437.825 MHz	—	AFSK 1k2
145.825 MHz	145.825 MHz	—	AFSK 1k2
144.490 MHz	145.800 MHz	—	FM
145.200 MHz	145.800 MHz	—	FM
—	437.800 MHz	—	FSK 9k6
—	437.800 MHz	—	SSTV
—	145.800 MHz	—	SSTV
—	437.550 MHz	—	SSTV
—	435.400 MHz	—	FM
—	2425.000 MHz	—	FM
—	2375.000 MHz	—	FM
—	2395.000 MHz	—	DVB-S2

Nominal frequencies, without Doppler. The live map shifts them for your station during a pass. Frequencies: SatNOGS DB (modified: working amateur transmitters only, in MHz), CC BY-SA 4.0.

About ISS

The International Space Station carries amateur radio equipment run by ARISS (Amateur Radio on the International Space Station). Since 2000 astronauts and cosmonauts have used it to talk to schools and to radio amateurs on the ground.

Several modes run on the station at different times. The cross-band FM repeater listens on 145.990 MHz with a 67.0 Hz CTCSS tone and transmits on 437.800 MHz. The station also runs an APRS digipeater at 1200 baud, traditionally on 145.825 MHz and at times on 437.825 MHz; check the ARISS status page for the current frequency. During SSTV events the ISS sends pictures on 145.800 MHz FM, which you can receive with a handheld and a phone app. Scheduled contacts with schools use the station's radios on frequencies announced by ARISS, often with a 145.800 MHz downlink.

The ISS orbits at about 420 km, so a pass lasts at most about 10 minutes and the signal is strong: a handheld with its own antenna can often hear it. On the repeater, give your callsign and grid locator, keep it short, and leave room for others.

Status

Active: amateurs reported hearing ISS on AMSAT 1 h ago.

From reports filed on AMSAT, last 30 days.

Orbit

Type	Low Earth orbit
Altitude	416–425 km
Inclination	51.6°
Period	93.0 min
TLE epoch	2026-10-08 23:34 UTC

Orbital elements: CelesTrak, checked every 3 hours.

Questions about ISS

What is the ISS uplink frequency?: ISS listens on 145.990 MHz (FM), 437.825 MHz (AFSK 1k2), 145.825 MHz (AFSK 1k2), 144.490 MHz (FM) and 145.200 MHz (FM).
What is the ISS downlink frequency?: ISS transmits on 437.800 MHz (FM), 437.825 MHz (AFSK 1k2), 145.825 MHz (AFSK 1k2), 145.800 MHz (FM), 145.800 MHz (FM), 437.800 MHz (FSK 9k6), 437.800 MHz (SSTV), 145.800 MHz (SSTV), 437.550 MHz (SSTV), 435.400 MHz (FM), 2425.000 MHz (FM), 2375.000 MHz (FM) and 2395.000 MHz (DVB-S2).
Is ISS active?: Active: amateurs reported hearing ISS on AMSAT 1 h ago.
When does ISS pass over my location?: Open ISS on the live map and enter your Maidenhead locator or use GPS: the tracker lists the passes of the next 24 hours with AOS, maximum elevation and LOS, and shifts the frequencies for Doppler.

ISS