Sec. 22.811 Idle tone.
Whenever a ground station transmitter authorized to transmit on any
of the communications channels listed in Sec. 22.805 is available for
service but is not providing service, a modulated signal must be
continuously transmitted on the communication channel assigned to that
transmitter. While this modulated signal is transmitted, the transmitter
power must be between 10 and 20 dB lower than the normal transmitting
power.
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