It keeps drivers awake during long drives to mission base.

It allows us to listen to news broadcasts.

It still works when commercial communications systems fail

The radios were purchased from The Simplex Radio Corporation

One radio talks directly to another

It uses a “simple” frequency with no sub-audible tone

You can talk and hear without releasing the Push-to-talk button.

You can talk to two stations at the same time on different channels.

Repeaters receive one frequency and automatically send the signal back out on another frequency.

To talk to someone hundreds of miles away, or even across the country

If the IC has to talk to an aircraft in another town

When you want to listen to the latest foreign news

If a forward operating base is too far away for HF communications.

To talk to someone close, when you are “line-of-sight”, either direct or through repeaters.

When you are too close to use ISR radios.

No, but they can interoperate

Yes, they are the same

No, they are different