A system comprising: a first transducer configured to convert electromagnetic signals into electrical signals; and a first integrated circuit, IC, operatively coupled to the transducer, the IC including: a receiver circuit for receiving from the transducer a first radio- frequency electrical signal in an extremely high frequency, EHF, band and transforming the first radio-frequency electrical signal into a first baseband signal, and outputting the first baseband signal when a control signal has a first state and not when the control signal has a second state different than the first state; and a signal-detector circuit responsive to a monitor signal representative of the first baseband signal for generating the control signal with the first state when the monitor signal indicates the first baseband signal is an acceptable signal and with the second state when the monitor signal indicates the first baseband signal is not an acceptable signal wherein the signal-detector circuit includes a comparator for comparing a characteristic of the monitor signal to a reference, the comparator generating an output signal indicating how the characteristic of the monitor signal compares to the reference, the signal-detector circuit generating the control signal in response to the output signal. a first transducer configured to convert electromagnetic signals into electrical signals; and a first integrated circuit, IC, operatively coupled to the transducer, the IC including: a receiver circuit for receiving from the transducer a first radio- frequency electrical signal in an extremely high frequency, EHF, band and transforming the first radio-frequency electrical signal into a first baseband signal, and outputting the first baseband signal when a control signal has a first state and not when the control signal has a second state different than the first state; and a signal-detector circuit responsive to a monitor signal representative of the first baseband signal for generating the control signal with the first state when the monitor signal indicates the first baseband signal is an acceptable signal and with the second state when the monitor signal indicates the first baseband signal is not an acceptable signal wherein the signal-detector circuit includes a comparator for comparing a characteristic of the monitor signal to a reference, the comparator generating an output signal indicating how the characteristic of the monitor signal compares to the reference, the signal-detector circuit generating the control signal in response to the output signal. a receiver circuit for receiving from the transducer a first radio- frequency electrical signal in an extremely high frequency, EHF, band and transforming the first radio-frequency electrical signal into a first baseband signal, and outputting the first baseband signal when a control signal has a first state and not when the control signal has a second state different than the first state; and a signal-detector circuit responsive to a monitor signal representative of the first baseband signal for generating the control signal with the first state when the monitor signal indicates the first baseband signal is an acceptable signal and with the second state when the monitor signal indicates the first baseband signal is not an acceptable signal wherein the signal-detector circuit includes a comparator for comparing a characteristic of the monitor signal to a reference, the comparator generating an output signal indicating how the characteristic of the monitor signal compares to the reference, the signal-detector circuit generating the control signal in response to the output signal.