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ADCP-75-214 • Issue 2 • September 2006
Page 17
© 2006, ADC Telecommunications, Inc.
4.5 Return Loss Sweep Guide
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
RL dB
v1 v2 v1 v2
18270-A
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
RL dB
v1 v2 v1 v2
RETURN LOSS SWEEP GUIDE FOR THE RECEIVE SECTION OF THE MHUs.
GOOD BAD
RESISTANCE LOOKING INTO THE FEEDLINE SHOULD INDICATE HIGH OR INFINITE OHMS.
GOOD BAD
NORMAL IN-SYSTEM SWEEP. TYPICAL. DEGRADATION FROM NORMAL SYSTEM SWEEP.
RL IS STILL GOOD IN RX BAND.
RECOMMEND CONNECTOR/LINE/ANTENNA CHECKS
DURING NEXT SCHEDULED MAINTENANCE PERIOD WHEN
TOWER CREW AVAILABLE.
ANTENNA PORT: TERMINATED WITH 50 OHM LOAD.
"PERFECT ANTENNA" < 50 OHM LOAD >
ANTENNA PORT: ANTENNA CATASTROPHICALLY
FAILED "OPEN".
ANTENNA PORT: ANTENNA CATASTROPHICALLY
FUSED "SHORT".