@ZMAN : Unfortunately no. Apart from the technical aspects of frequency generation, police use "trunking" radio systems consisting of:
- A System Controller - Assigns voice frequencies to active channels
- A Voice Frequency Pool - Used for voice communications within the system
- Thousands of Talk Group IDs - Used to identify channels within the system
Each radio broadcast is computer-routed and two calls from an officer (even seconds apart) can be routed through separate trunking assignments. Think of it as "listening to a car radio" and having to change channels between multiple stations to hear the music". Only in nanoseconds.
On top of that, there are different proprietary trunking systems among Harris County and Texas/Federal agencies.
Sorry.