Perhaps one of the more intriguing uses for radio broadcasting is spying. Covert radio stations broadcasting coded number or letter groups have been the interest of SWL and others for years. The Conet Project sought to gather several of these recordings and make a CD out of them. What they ended up with is a rather spooky 4 CD set of various spy numbers stations through out the world conducting their business which dates back to 1997. Since that date, samples of those recordings have been used in several movies and by recording artists.
While stationed on Guam doing important work for the government, we would often come across these numbers stations in the late 1980’s. An East German numbers station was only 1 KHz away from one of our working frequencies, thus around 2 am local time, an East German lady would regale me with half an hour of five number groups in German, which being slightly off frequency, was utterly delightful. We knew where it came from because of this and others ones like it.
Sort of like that. That recording sounds like computer generated voice, ours was a real operator that would occasionally screw up.
Both are allegedly off the air now, surely replaced with something else. When pressed as to the purpose of these stations, a British information minister replied “They are what you think they are.”
The numbered groups are coded groups meant to be received by agents in the field. The use of unique interval music helps to identify the broadcast. Once those field agents have written down the coded groups, they use a one time pad to decode them. The one time pad is then destroyed. In all, it makes for a system that is almost unbreakable by any currently known analytical system.
In March 2003 on the eve of the Iraq war, also known as Operation Iraqi Freedom, NY radio station WFMU played the entire 4 CD set, appropriately freaking everybody out.