ADC ClearGain Dual Inline Tower Mounted Amplifier System User Manual

Page 18

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ADCP-75-214 • Issue 2 • September 2006

Page 12
© 2006, ADC Telecommunications, Inc.

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