User Manual

112 Part 004071A revision 00b August 6, 2003
Amosphere NPM Installation Procedures (MMDS)
Table 4.19 shows the correlation between VSWR, return loss, and the percentage
of reflected power.
 To measure the VSWR of RF equipment
1 Power on and calibrate your cable sweep analyzer.
2 Power off the RFSS module connected to the RF equipment you want to test.
See page 116 for a list of circuit breakers.
3 Carefully disconnect the RF equipment and cables you want to test.
4 Connect the cable sweep analyzer to the equipment and cables you want to test.
NOTE: Be careful not to damage any cables or connectors
when connecting the analyzer to the RF equipment.
Due to the use of the tower-mounted amplifier (TMA), all cable
sweeps must measure the total length of the cable run (including
all connectors, jumpers, and CIN), using a DIN adapter
(female-female) in place of the TMA.
5 Perform the cable sweeps.
VSWR Return Loss (dB) Power Being Reflected (%)
1:1 N/A (infinite value) 0
1.25:1 19.1 1.2
1.5:1 14 4.0
1.75:1 11.3 7.4
2:1 9.5 11.1
5:1 3.5 44.7
N/A (infinite value) 0 100.0
Table 4.19 VSWR, Return Loss, and Reflected Power Conversions
!
WARNING: Extreme care must be taken when connecting or
disconnecting the coaxial antenna cable to avoid damage to the center pins.
Connectors should be torqued to a maximum of 17 foot-pounds and be free of
dirt or moisture. Do not over-torque the connectors as this can damage the
center pin and cause cable faults and other RF problems.
installation.book Page 112 Wednesday, August 6, 2003 6:06 PM