owtlaw, there is no stumbling involved around RR.
First, click "Database" in the blue toolbar above. Then select "Texas" on the map. Under the "Texas State Agencies" dropdown menu, select "Department of Public Safety (DPS)" and click the "Retrieve" button.
In the DPS database page, there is a statewide channel plan at the top (below the region map). You'll notice that the frequencies and NACs are recycled throughout the state, in a pattern where they won't interfere with each other. Scroll down to Region 3, and you can see the frequencies (base/mobile pairs and repeaters) specific to your area. Do some searching around the Texas forums for how DPS operates...
Sometimes you'll only hear one side of the conversation, for two reasons (and this is what I mean by searching the Forum). One reason is that the dispatcher is constantly monitoring many frequencies, and when she responds to one of the troopers in the field, she will be broadcasting on all of her linked sites. That's the reason you'll hear the trooper unit number during each transmission (so the other troopers know who she is talking to). The other reason you'' only hear one side is called half-duplex (for the base/mobile pairs). If you're interested enough, I'll explain that one later.
