Website dedicated to the Robust Packet Network with dynamic map of current stations, RP documentation, List of capable modems
Ray-trace radio signals through a realistic three-dimensional ionosphere using Proplab-Pro. This software has been used by the military, researchers, universities and amateur radio operators around the world to assist in determining radio propagation conditions and radio signal behavior. It is one of the most respected and well established software packages for radio engineers and enthusiasts, being actively updated for over 28 years.
Use this form to generate a list of amateur repeaters and broadcast transmitters to your specifications. The database covers the fifty U.S. states, the District of Columbia, and the ten Canadian provinces.
Radio transmission is affected by the presence of the earth. Also, the upper atmosphere of the earth is a rarefied, ionized, conducting region that influences transmission considerably. Undertanding Wave Diffraction, Wave Refraction and Absorption
SMARC provides a list of HF nets available to local Hams with the right equipment. Join one or all of them
The Answer to the question, who invented radio, probably depends on where you are from. You may answer Popov or Marconi. They had a very different views about radio
Doppler Whistles from Meteor Trails, few hams know that meteors can be spotted without leaving the operating room. Identifying Meteor-Trail Reflections, Shooting Stars, Why the Meteors Whistle