The Golden Days of shortwave listening.

[Skywave]

The Russian Woodpecker: for those who might be wondering what that was and what all the fuss was about . . . .

Here's a sound clip:

http://www.youtube.com/watch?v=aOMVdOc9UbE

and here's a Wiki. reference:

http://en.wikipedia.org/wiki/Russian_Woodpecker

For the enthusiastic SWL, the most useful thing about the Woodpecker was its use for testing noise limiters in comms. radios!

Al.