Many of us will recall the radio broadcasts by countries during the cold war. All sides tried to outdo the other with propaganda. I recall getting some excellent gifts from Radio Peking, even though I had no interest in their, or anybody else's, propaganda!
One of the famous ones was Radio Moscow. I heard this very well with my shortwave crystal set and remembering getting a QSL card from this and many. I have attached a link to their interval signal. It is quite a large MP3 file (22M) so may take a time to come through.
