| 摘要 |
A method and apparatus for controlling test devices as needed without interfering with the power of the mast head amplifier or the RF signals. The method and apparatus controls the on/off state of remote devices using a single medium. The present invention includes a first signal generator for generating a signal at a first frequency for controlling the remote device. Next is the signal superimposed at the first frequency on a medium carrying a communications signal at a second frequency. It also includes a detector disposed at a remote location, for detecting the signal at the first frequency on the medium and a processing circuit, coupled to the detector, for controlling the device in response to the detection of the signal at the first frequency on the medium. |
