Getting the bitstream of an unknown RF signal
First I found the sine wave extrema (black markers at the bottom) and stretched and superimposed a sine wave graph (red) on top of the signal graph with the extrema in the same locations. The signal matches (0) the sine wave over some of the non-zero segments, and over the other non-zero segments it matches the sine wave with a sign flip (1). This gives a binary sequence.

A sign flip is equivalent to a 180 degree phase shift, so this is a form of binary phase shift keying (BPSK, 2PSK, also phase reversal keying, PRK) with the useful symbol interval duration (of each sinusoid piece) seemingly equal to the guard interval duration (of each zero-valued segment that separates symbols). It is unusual that here the symbol rate is higher than the sine wave frequency, with a ratio of about $20/7\approx2.86$.