V H F B I D I R E C T I O N A L A M P L I F I E R T E C H N I C A L M A N U A L
7
Led Indicator Alarm and Manual Level Control
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The unit has visual alarms using LED indicators for the following conditions; AGC, S/D, OSC, power
and VSWR.
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AGC: alarm turns red when the AGC is not delivering any attenuation. This can happen in two
situations. Either the AGC is turned off by the user (see monitoring and control section) or if
the signal at input of the DL is too weak. This is not necessarily a failure. It can just be a warning
that the signal from the BTS is too weak.
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S/D: The shutdown indicator turns red when the system is in automatic shutdown. This happens
when the internal temperature is too high or when the output power exceeds the maximum limit
allowed. When the RF module is turned off by the user (see monitoring and control section)
the S/D indicator will start flashing.
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The Power indicator turns red when the RFM is not receiving the correct DC power.
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OSC indicator turns red when oscillation occurs in the system.
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VSWR indicator turns red when an antenna mismatch occurs in the system.
