The purpose of the IARU Intruder Watch Service Wiki is to assist users in recognizing and identifying the most usual transmission modes used by non-amateur radio stations in the amateur radio bands.

Each mode is accompanied by a discreet technical description, as well as recordings of its sound, images of each signal as they appear on the waterfall of an SDR receiver, and a video capture of the transmissions when available.

In constant evolution, this Wiki will be enriched as new signals will be received and processed, and as we get better screenshots / audio / video recordings of them.