After more research,
I have discovered that in AFSK mode, the transmitter uses one frequency for transmission. I think it is about 144Mhz. This mode transmits two audio tones at 2 frequencies. One frequency is 1200hz and I think that is the space tone (binary 0). The other one is at 2200hz.
In FSK, Two carrier frequencies are used for transmission, and the website (I can't remember the URL of it) states that FSK can go at higher speeds than AFSK.
But I still need to know the two carrier frequencies used. One carrier frequency must be a mark, and the other, a space.
What do I transmit on the mark frequency for a valid mark signal (in FSK)?
What do I transmit on the space frequency for a valid space signal (in FSK)?