This time the sound was not coming from thousands of miles away, over a radio circuit.

It had no meaning beyond being easy to say and easily recognizable on a radio circuit.

"So, you listened in on the radio circuit the whole time?"

Tom was eager to tackle work on the radio circuits.

He set up a radio circuit on a special channel.

He was running the radio circuits, for the most part.

A new voice came up on the radio circuit.

We'll put you out over one of our radio circuits.

"Confirm five of them," another voice agreed on the radio circuit.

"That's our subject, guys," a female agent said over the radio circuit.