CFARS - Operations
Canadian Forces Affiliate Radio System

HF Propagation Prediction and Ionospheric Communications Analysis

Free professional HF propagation prediction software from NTIA/ITS, originally developed for Voice of America (VOA).

This guide should get you well started with VOACAP. A more comprehensive discussion about the finer details of using the software can be found in George Lane's book Signal-to-Noise Predictions Using VOACAP. A User's Guide.

PROPAGATION PLANNER - Professional HF contest & DX expedition planning tool

VOACAP ONLINE - Professional-grade high-frequency (3-30 MHz) point-to-point propagation predictions

VOACAP ONLINE COVERAGE MAPS - Professional-grade high-frequency (3-30 MHz) coverage area predictions