el_supremo:
With CW, the carrier is turned on and off. WWVB transmissions involve reducing the carrier power by 17dB at the start of each second and then returning to full power 0.2 (0), 0.5 (1) or 0.8 (P) seconds later. The carrier is always on but just reduced in power which modulates the amplitude and produces a pulse-width modulated signal. Maybe the OP's signal does something like this.Pete
Yes, that could be. I meditated on his posting while working out on the company tread mill. I wonder is all the information he has given is 'POST DEMODULATION' but the dongle and the pc software? Modulation by carrier amplitude would seem to be so error prone that simple FM or PM modulation would be easier.
Need more information!!!
Paul