1. In radio communications systems, pertaining to a station that is transmitting a carrier , whether or not the carrier is modulated. 2. In a radio station, pertaining to a particular source of modulation , such as a specific microphone, that is connected, i.e., is capable of modulating the carrier.
ON THE AIR
Meaning of ON THE AIR in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012