Do you guys not remember Max? I used to watch him on Saturday morning. Imagine a stuttering robot ranting on about absolutely nothing. It's what "Small Wonder" should have been.
I don't remember that there was a show, but I remember the character. I didn't know he was advertising Coke, though, in my mind I had him hocking Pepsi.
That Russian signal one is pretty bizarre. I'm not studied in the subject, but from a layman's perspective the idea that the signal may indicate that a certain installation is up and running makes a lot of sense. The other weird noise one from the U.S. is almost certainly some sort of encrypted transmission, but that Russian regular buzzing? It doesn't seem like it.