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Amateur Radio Command Center
Explore the bands, check solar conditions, and listen to the world.
YOUR LOCAL TIME—
UTC / ZULU—
Solar & radio conditions
Measurements from NOAA SWPC. These describe the Sun and geomagnetic field; they do not guarantee a particular band will be open.
Solar radio emission, in solar flux units (sfu).
Measured solar wind speed, km/s.
Kp ranges from 0–9; 5 and above is a geomagnetic storm. Higher solar flux can help some HF paths, while storms can disrupt them. Time of day, season, frequency, and path also matter.
NOAA Space Weather Prediction Center →Tune in
Listen with the existing runslinux receiver. Start by tuning slowly and matching the receiver mode to the signal you hear.
Open the radio receiver ↗Opens in another tab so you can keep these tools beside it. Available frequencies depend on the receiver hardware, antenna, and current configuration.
- AM: broadcast stations and some voice services.
- SSB: many amateur HF voice conversations; USB or LSB must match.
- CW: Morse code signals.
- FM: many local VHF/UHF voice signals.
Find your band
Broad learning guide, not a transmit authorization. Region, license class, mode, and local band plans determine privileges.
ARRL band plans →Day, night & the gray line
The transition between daylight and darkness can influence some HF paths. This map shows approximate current sunlight, not a propagation forecast.