Mission Critical Communications will depend on interoperability between land mobile radios (LMR) and LTE cellular networks

Interoperability, the ability to link two-way radio systems and the cellular network is key for the mission critical communications first responders require today.

Two-way radio repeaters are few and far between because of costs. The coverage of two-way radio repeaters are designed for specific agencies to cover specific areas. The ability to link these two-way radio systems with the cellular network during emergencies expands the range of the two-way radio system to that of the cellular network.

The ability to link two-way radio systems and the cellular network allows interoperability between agencies. 

The ability to link smartphones to two-way radio systems in minutes with range limited only by the cellular system. 

For personal use or smaller agencies with limited budgets can find alternatives to expensive equipment on eBay. 

Equipment
For $5.00 on eBay you can get a Bluetooth shutter button for cameras. It can also work as a PTT button for your smartphone for walkie-talkie apps like Zello or HT by DWP turn smartphones into two-way radios.

Zello or HT by DWP  These apps can also connect you to the internet allowing you to link your two-way radio system. Linking your radio system can turn every smartphone on the system into a two-way radio. 

You can add people to your radio network without time consuming reprogramming. They allow you to create new secure channels on the fly adding or removing agencies or people as needed.

Ham Radio Operators
Ham radio operators are always experimenting with new equipment and technologies. One of today's new technologies is RoIP Radio over Internet Protocol. RoIP allows the linking base radios, repeaters, mobile radios, and hot spots over the internet to expand communications abilities.

New radios like Vero's VR-N7500 have the ability for Internet linking, but also use Bluetooth 5.0 to control the radio from an app.  

The image on the right shows one of the 16 channel frequency banks of the VR-N7500

Digital Hotspots for DMR
These hotspots allow you to connect your base, mobile, or handheld radio to the internet. Add a data connection to your tablet and you have mobile DMR access to the world...