Information and on-air tests of many keyboard-based modes that can be used on the 600 Meter band.
A homebrew phasing-type SSB exciter for use with the various sound card digital modes in the 505-515 kHz band.
Want to prove your Effective Radiated Power? Have you made an antenna change and want to see what difference it made? Take your own field strength readings with properly calibrated equipment.
There's more to life at LF than CW! This article gives a brief description of the alternatives, and links to the programs used for transmitting and receiving them.
Now includes a chart comparing the times needed for a simple message.