Description

HF Bands is a ham radio app for checking band conditions and solar data before CW, contesting, POTA, SOTA, ARRL Field Day, or any other operating. Values sit on a black background, with yellow labels and green, yellow, or red numbers.

Three pages. UP and DOWN move between them. SELECT asks the phone for a fresh reading.

HF Conditions shows the update time, solar flux, sunspot number, A index, and K index, plus day and night conditions for 80–40 m, 30–20 m, 17–15 m, and 12–10 m. Cells read Good, Fair, Poor, or Closed.

Solar Data adds X-ray, 304 Å, proton flux, electron flux, aurora, normalization, solar wind, Bz, auroral latitude, MUF, geomagnetic field, and signal noise.

VHF Conditions shows aurora and sporadic-E for Europe, North America, Europe 6 m, and Europe 4 m.

The phone loads the solar report from hamqsl.com. If that site does not answer, it uses NOAA Space Weather Prediction Center summaries instead. On that fallback, the HF and VHF colors are estimates from solar flux and the K index. The last reading stays on the watch until the next update. A new reading needs the phone nearby.