| 摘要 |
A computerized monitoring apparatus processes signals representing (a) incident power I<SUP>2 </SUP>to an antenna, (b) reflected power R<SUP>2</SUP>, radiated power T<SUP>2</SUP>, and arc voltage power A<SUP>2</SUP>. The monitor provides warning of arcing or overheating in the feedlines to (and inside) the antenna before catastrophic failure. Early warning of developing failures allows for orderly transition to standby transmission and avoids losing on-air time. The monitoring apparatus also provides a failsafe indication of whether power is delivered to the antenna and whether the antenna radiates the power delivered to it. Such failsafe indication is required before personnel are allowed near the antenna. The apparatus measures the relative power density at specified locations near and on the tower, and compares the measured RFR exposure density to that allowable by the Federal Communications Commission. The monitoring apparatus can be applied to multiple transmitters with multiple channel combiners feeding a common antenna connection.
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