sentences:  They can be separated in the receiver because each transmitter's radio waves oscillate at a different rate, in other words each transmitter has a different frequency, measured in kilohertz (kHz), megahertz (MHz) or gigahertz (GHz).The bandpass filter in the receiver consists of a tuned circuit which acts like a resonator, similarly to a tuning fork.It has a natural resonant frequency at which it oscillates.