call sign , also: callsign
cal letters
call signal

I tried the call sign three times with no answer.

Each call sign may be used for 15 days from its issue.

He had explained the call sign system to me once.

We just heard another flight using our call sign down there.

"He used the other call sign and we all bought it!"

That's your call sign, at least the one you're using on this mission.

Despite the call sign changes the program stays much of the same.

Each country has a different set of patterns for its own call signs.

Both will have the same call sign as the main signal.

Let me know your call sign when you check out with operations.

Immediately he heard a man speaking his call sign on the radio.

It had stuck all these years, as first call signs usually do.

Or maybe there was no one tapping out a call sign any more.

It begins with the call sign and name of the ship.

And we even get to make up our own call signs."

She decided to give her little capsule a call sign: Friendship-7.

The current call signs were assumed on July 15, 2004.

Sometimes he gets confused and uses the wrong call sign.

The station has previously gone under several call signs in its past.

Military flights often use more than one call sign during a flight.

The battalion has been known by various call signs over the years.

This call sign must stay with the message to the point of delivery.

The call sign is now issued to a Saudi national.

Pressing Talk, she gave the call sign for the helicopter.