radio telegraph auto-alarm
radio-telegraph installation
radio-telegraph transmitter
safe radio telegraph certificate
self-oscillator radio telegraph transmitter
International Radio Consultative Committee for Telegraph and Telephone
station radio set of radio dispatching telephone for train
A radio-telemetry system
Absolute Radio Frequency Channel
Absolute Radio Frequency Channel Number ARFCN
acknowledged mode radio link control
active radio frequency identification
active radio frequency Identification technology
Active radio frequency system