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ADCP-75-214 • Issue 2 • September 2006
Page 12
© 2006, ADC Telecommunications, Inc.
4 TROUBLESHOOTING 4-PORT CLEARGAIN DUAL INLINE DUAL DUPLEX
TOWER MOUNTED AMPLIFIERS
Trouble is visually indicated by LED's or no LED illumination on a specific MHU, swap Bias-T
cables on PDU ports to see if trouble remains or moves (reference Figure 8). See Figure 10 for
possible trouble points.
Figure 10. Tower Mounted Amplifiers
21299-A
MASTHEAD
UNIT (MHU)
FEEDLINE
JUMPERS
ANTENNA
JUMPER
HARD LINE
SHELTER
HARD LINE
TEST
POINT
NOTE: COMMON FAILURE
POINTS ARE THE ANTENNA
AND FEEDLINE JUMPERS/
CONNECTORS.
CHECK IF EXTERNAL JUMPERS
OR SURGE PROTECTORS ARE PRESENT.
IF A SURGE PROTECTOR IS ANYWHERE
BETWEEN THE BIAS-T AND THE MHU
IT MUST BE ABLE TO PASS DC.
ANTENNA
JUMPER