Dallas Police operate on conventional repeaters which gives them some functionality you don't get with trunked systems. Dallas likes to talk simplex on the repeater outputs. That's where all this chatter occurs and there is a lot of it. You just have to be in the area to hear it. It gets very interesting at times.
Russell
Some departments I'm use to the dispatcher or sargent willl broadcast over the radio street perimeter on robbery or B&E calls.
Ohers use computer.
When it comes to MVA calls ,shooting or stabbing calls patient update is none over radio well more patient update is done on cell phone because of all the privacy act laws.You know if it is life threatening injuries or not but that is all.
When I was in Dalls I never hear patient update on MVA calls ,shooting or stabbing .
Also I never hear street perimeter on robbery or B&E calls.May be that done over computer or they just drive around the area looking for mad guy.
When came to active shooter or person with gun , I never hear Sargent say like other departments do not approach the area to I get there and back up.
You will hear when they have the guy and every thing is okay they will get on the radio and ask other units to down grade to code one.