PhosphorHz is a real-time HF radio propagation monitor for amateur radio operators. It pulls live space weather data from NOAA's Space Weather Prediction Center and translates it into band-by-band conditions you can act on — right now, from your location — all rendered on a retro CRT phosphor display.
FEATURES
- Real-time band conditions for 160m through 6m, derived from live NOAA data
- MUF calculation from Solar Flux Index, solar zenith angle, and Kp depression
- Path-specific propagation to multiple DX targets using great-circle geometry
- 3D interactive greyline globe with solar terminator visualisation
- Full solar index dashboard: SFI, Kp, SSN, Bz, X-ray flux, NOAA R/S/G scales
- Kp index 24-hour bar chart and SFI 30-day trend line
- Space weather alerts filtered for HF relevance
- Sunrise/sunset times with countdown to next solar event
- Day/night/greyline status at your QTH
- Maidenhead grid locator display with automatic or manual location
- Green and amber phosphor CRT colour themes
- No ads, no tracking, no subscription
DATA SOURCE
All space weather data is provided by the NOAA Space Weather Prediction Center (SWPC), a US Government public domain data source. No account or API key required.
SUPPORT
Need help with PhosphorHz? Whether you have a question about how the app works, want to request a feature, or need to report a problem, you can reach us through the following channels:
- Ask a question — get help with using PhosphorHz
- Report a bug — let us know if something isn't working
- Request a feature — suggest improvements or new functionality
We aim to respond to all support requests promptly. You can also browse existing issues to see if your question has already been answered.