I'm hearing a strong digital signal of some sort when my radio is in CW
mode, on 4.005 MHz in north Texas during the evening hours. Sounds like
high-speed Morse code. I've done a web search with no luck, except that
Vatican Radio supposedly transmits on that frequency. Any idea what this is
and where it's coming from?

Thanks!

Matt J. McCullar, KJ5BA
Arlington, TX