drewsonixLess exciting when you know what it is, I'm afraid!
It's a Lindos test from a machine of this type: http://www.lindos.co.uk/la100oldl.jpg
As well as fixed frequency tones and sweeps the chirpy part (which sounds like a dial-up modem) contains data that the receiving machine can decode - you can put the name of the station or even a short message there. There may be some standard convention for what you should put there, though.
IsweetweetMaybe the alien prawns of District 9 have invaded..what's happening at Radio 4?
ScottKeirDoesn't it just? It did it again, just in the middle of the 3am news - just for a couple of minutes and then back to the news.
That was recorded off an analogue radio set, not digital.
