Visualisation projects
With the ILLW (International Lighthouse and Lightship Weekend) coming in August, here's a map of all the lighthouses across the globe. Perhaps there's one near you!
An RTL dongle can be used to create a band survey showing radio interference over time. This chart shows time vs frequency vs intensity in two different formats.
Based on data from the 1996 Gazetteer of Australia I generated a KMZ file that shows their locations.
To measure the audio response of your transmitter, you can generate an audio file, transmit it, receive it, record it and compare the spectrograms between the original and the recorded audio.