From left: Verizon Wireless, AT and T-Mobile USA.

At the center of this group is Rivada Networks, a startup with a technology called DSA Dynamic Spectrum Arbitrage .

Some mobile devices already have radios for the spectrum FirstNet will use, called Band 14, and a wide range of devices should have them by the time the network goes live, Rivada says.

Carriers will have to do some careful cost analysis, analyst Lynnette Luna of Current Analysis said earlier this year.

Black & Veatch is a major telecom construction firm.

The company also says it can give first responders broader coverage beyond the FirstNet system through roaming on an unnamed national mobile carrier.

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