| 摘要 |
PURPOSE:To discriminate signal deterioration of a different-polarized-wave side device due to the maintenance of a one-polarized-wave side device as a fault. CONSTITUTION:Digital radio devices 1-1 and 1-2 which perform both polarized wave transmission have switches 2-1 and 2-2 for maintenance output which report the maintenance states of the respective devices and light emitting elements 3-1 and 3-2 which display the states wherein the respective devices are put in the maintenance states with those switches 2-1 and 2-2. A maintenance information transmission line 4 which reports the maintenance states is provided between the digital radio devices 1-1 and 1-2 and then the signal deterioration of the different-polarized-wave side device due to the maintenance of the one- polarized-wave side device is discriminated as signal deterioration due to the fault. |
