Short wave radio can pick up intermittent frequencies and satellite phones do operate.

Once there they discover hyper wave radio isn't working properly.

A short wave radio and siren would be added to the car by 1941.

His early books had dealt with radionavigation, aerials for short wave radio, and thermodynamics.

Some short wave radios managed quite satisfactorily with these devices.

This included in the third shot of the series a radio transmitter designed to hit standard wave radios immediately beneath the satellite.

Seven hours later the message rocket took off, the first one capable of reaching every standard wave radio on earth.

Some investigators believed the explosion was an accident caused by a radio signal, possibly from a short wave radio or a passing police car.

(all sent by short wave amateur radio and digital packet-radio)

He deduces that the instructions are being sent from inside the prison via a short wave radio.