circuit board base site (38) for use in a telecommunications system (10) having a plurality of base sites can affect a communications channel to be used by a communication unit (16) in response to a request for a communications channel from the communication unit.the circuit includes a receiver's location (34) operating in a low sensitivity mode when no request is received for the communications channel, and operating in a high sensitivity mode is activated by a control signal.the base site also includes a transmitter (34) is activated by the control signal, and a control circuit (32) coupled to the receiver and to the transmitter that they control. the controller transmits the control signal to the transmitter and the receiver, in response to a request from the communications channel.
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