What is I/Q data in RF?

I/Q data in RF is a type of digital modulation used in radio transmission. It stands for "In-phase/Quadrature" and is a type of complex modulation that combines two separate amplitude-modulated (AM) signals. The two signals used in I/Q modulation are in phase and quadrature, which means that one signal is shifted in phase by 90 degrees. This creates a phase differential between the two signals, which is used to encode the data being sent. I/Q data is often used in primary / Land Mobile Radio (trunked) communications and military communications.