The sine angle is in radians and ω is the frequency in radians. The Φ stands for a phase shift. So you can think of A as the amplitude ... no matter the actual size of that circle.

Three of the most common digital modulation schemes you’ll see in specifications are Frequency Shift Keying (FSK), Amplitude Shift Keying (ASK), and LoRa (Long Range). To wrap my mechanically ...