| 摘要 |
<p>PROBLEM TO BE SOLVED: To avoid influence of noise or fading generated from a power generator. SOLUTION: Terminals 9 for controlling and monitoring a lamping unit or the like are connected in series with a power line 5 lead from the power generator 4 via a master station 8 and a rubber transformer 10. A signal is communicated between the station and the respective terminals by using a power line carrier. In order to avoid a drop of a reception level due to the influence of the noise or fading generated from the generator, a monitor control system using the power line carrier for conducting doubling of the reception comprises a filter unit 6 having LC resonance circuits (L1C1, L2C2) for resonating in a frequency used in the power line carrier at a power line near the output side of the generator, compensating reactance elements L11 and L12 provided at the power line 5, or two sensors CT12 and CT13 provided at the power line as signal extracting sensors of the station.</p> |
