Troubleshooting 4-Port Cleargain Dual Inline Dual Duplex Tower Mounted Amplifiers - ADC ClearGain Dual Inline Tower Mounted Amplifier System User Manual

ADCP-75-214 • Issue 2 • September 2006
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
possible trouble points.
Page 12
© 2006, ADC Telecommunications, Inc.
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.
Figure 10. Tower Mounted Amplifiers
ANTENNA
JUMPER
FEEDLINE
JUMPERS
HARD LINE
HARD LINE
SHELTER
TEST
POINT
Figure 8). See Figure 10
ANTENNA
JUMPER
MASTHEAD
UNIT (MHU)
21299-A
for