Parakalix
Free HF radio propagation tools.
Tools
VOACAP Propagation Prediction
Point-to-point HF reliability prediction, powered by the NTIA/ITS VOACAP engine — the US government standard model for high-frequency skywave propagation. Enter a circuit, month and solar activity, and get predicted reliability hour by hour.
Open VOACAP →Solar & Space Weather
Current solar flux, sunspot number and the A and K indices — the same space-weather inputs a propagation run depends on, in one place instead of four. Observations from NOAA’s Space Weather Prediction Center, updated every 15 minutes.
Open Solar & Space Weather →SPEED Build in progress
Terrain-aware RF link planning: path profiles and line-of-sight analysis over elevation data, for laying out circuits before you put antennas up.