Two day’s ago I’ve worked with the Saint Petersburg amateur radio station on “Echo-link”. His call sign was really surprised me. It was UH1AAC (novice class call sign). Another one was UA8AA (from UA9X region) also sounds very strange.
The Russian Woodpecker was a notorious Soviet signal that could be heard on the shortwave radio bands worldwide between July 1976 and December 1989. It sounded like a sharp, repetitive tapping noise, at 10 Hz, giving rise to the “Woodpecker” name. The random frequency hops disrupted legitimate broadcast, amateur radio, and utility transmissions and resulted…