Propagation Tools

HF Propagation & Long-Distance VHF

How to use the information on the Solar-Terrestrial Data dashboard.

Joining LWHC on ClubLog
ClubLog is a free website that helps operators be more effective and have more fun making on the air HF and Satellite contacts with distant stations around the world. New operators with a wire in a tree to seasoned contesters with million-dollar stations use ClubLog to connect with other enthusiasts…
Lake Washington Ham ClubK7LWH
Tonight's Aurora Forecast - Courtesy of NOAA Space Weather Prediction Center

D-Region Absorption

Highlighted areas are worse for HF conditions, very high attenuation = no sky-wave radio communication is possible in that area.

D-Region Absorption - Courtesy of NOAA Space Weather Prediction Center

Maximum Usable Frequency (MUF) HF

If a transmitter's frequency exceeds the MUF anywhere along the path between it and the receiver the signal will escape into outer space rather than be reflected back toward Earth.

Courtesy of prop.kc2g.com

View from sun

This the area currently lit by the sun. Enhanced propagation (grey-line) is often possible along the perimeter (sunright on right, sunset on left)

View from moon

This is the area visible from the moon.