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G2E02

How can a PACTOR modem or controller be used to determine if the channel is in use by other PACTOR stations?

Select	Answer
A	Unplug the data connector temporarily and see if the channel-busy indication is turned off
B	Transmit UI packets several times and wait to see if there is a response from another PACTOR station
C	Put the modem or controller in a mode which allows monitoring communications without a connection
D	Send the message: "Is this frequency in use?"

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