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On-the-air
In telecommunication, the term on-the-air has the following meanings:
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.
Source: from Federal Standard 1037C
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