Thunder rose, unslinging the small portable transmitter and receiver from his back.

Prior to that, the same call letters were assigned to a portable transmitter in Chicago (1926-28).

These portable transmitters send a signal to the alarm unit.

The portable transmitter did not have the range to reach Kahali on the lakeshore direct.

It's actually a portable transmitter, same as your bracelet was on Terra but with its own power source.

He risked his life to go back into the radio room to bring out the portable transmitter.

Before escaping the advancing security forces, he had managed to obtain a portable transmitter.

The sentry ran back to the guard shack and picked up a portable transmitter.

Moving quickly, the science officer stowed his communicator and took out a portable transmitter.

She could have been speaking over a portable transmitter here, only a few hundred feet from the control room.