I was testing my Radio Shack 200629 Synthesised World Receiver (RS's ATS505 -- I figured out how to keep it from sounding like a theremin -- it doesn't like mono SW EXT antenna plugs in the SW EXT stereo jack) and I tuned through the utility sections of the SW band, something I don't usually do.
With this radio, it's more fun to tune through the utility bands because it doesn't chuff, and tuning through a swath of HF spectrum is like tuning an analog radio.
Anyway, I came across a bizarre CW transmission on 6993 kHz (it may have been a kHz or two off -- the RS 200629 has a BFO with clarifier, and I may have had it tuned off by a kHz or two). It was sent by hand, because the characters varied in speed, with small breaks sometimes between them. Signal strength also varied, starting at around S3 and ending up between S0 and S2.
Here's an example of what I heard. The dots are breaks where it faded out. Spaces are where there were short pauses:
NR091 KN CCK35180201 ... (fade)... RMKSC7 ... (fades) (speeds up during fadeup)... N65 5t6 2 tu7... 3... N.... 5
CRTTN72UM05....
...it went on, and then stopped around 0106UTC.
Very strange. I'm guessing it was somebody messing with CW out of band, for the fun of it, or possibly a spy operation. Or maybe a military or government station testing by just sending out junk? I have no idea.
Doing a search, I guess some other HFU people have heard other stuff on 6993. Any one hear CW? I'm sure it wasn't an image. The sending was too bizarre for a ham or ship transmission.