While we are on the subject,,,,
I know of a department that utilizes 4-5 frequencies but has no CC. I hear short data bursts on, what I will refer to as, "Freq A". If there is radio traffic on Freq B, C, D, or E the traffic is always repeated on Freq A.
What kind of system is this? I have Freq A programmed as conventional but while is is sitting silent I believe the data bursts cause the bottom of the 436 display to display trunk information without any details. The pic I posted depicts what the screen will briefly display. I believe the short data bursts trigger this.