Electromagnetic field strength radiated from over-head telecommunication cables due to a 24Mbps-ADSL service ～Effects of multi-pair signal injection and signal loss of under ground cable

摘要

We are evaluating electric field strength radiated from over-head cables due to a 24Mbps-ADSL services because there are some concerns whether the field affects to the 1.9 MHz band amateur radio communications or not. In this paper we investigated factors representing increase of the field strength depending on the number of signal injected pairs and effect of signal loss of under ground cable. The maximum field strength at 3 m away from the cable in the 1.9 MHz amateur radio band is estimated under -2 dBμV/m, when the field strength increases 6 dB if the signal injected pair is twice and the signal loss of under ground cable is 11.6 dB.