Field notes on Zello and two-way radio

Conventional business radios usually need an FCC Part 90 license. Push-to-talk over cellular does not, because the carrier already holds the spectrum. Here is how to tell which rules apply to you.

Intrinsically safe is a certification, not a marketing phrase. Here is what it guarantees, how hazardous areas are classified, and why the radio has to be matched to your site before anyone carries it in.

Phones are for conversations. Radios are for coordination. Here is the honest case for each, and why a modern radio can run on the cell network without inheriting a phone's habits.

You do not have to retire a working radio fleet to get wide-area push-to-talk. A gateway bridges selected channels between the old system and the new one. Here is how it works and what to check first.

A straight answer on price: what Managed Zello costs per user per month, what every plan includes, what hardware costs, and how it compares with buying and licensing your own fleet.

Every carrier map says nationwide. That word describes population, not geography, and the three Tier-1 networks do not cover the same ground. Here is what actually varies, why it matters more for push-to-talk than for a phone, and how we handle it.

Nextel’s Direct Connect was push-to-talk over a cellular network years before the industry had a name for it. Here is what actually happened to the network, why the idea outlived the technology, and what the modern equivalent looks like.