I received this signal around 7 MHz. I've checked all over the "Signal Identification Wiki", but cannot find anything similar to this. I'm pretty sure this is some simple FSK, but that is the exact type?
The signal is at around 2200Hz (in audio file). Partial spectrogram:
The WAV can be downloaded here: https://nofile.io/f/CjEk6A513W8/radiodata.wav