Pa Input Signal Alarm; Pa Output Signal Alarm; Reverse Lna Channel Verification; Lna Output Level Verification - Andrew 2400 Operation And Maintenance Manual

385700-4006-006
2.5.3.3.2

PA Input Signal Alarm

Attach a voltmeter to J4-3 on the Alarm I/O relay board (PA output alarm test point). TP1 or
TP2 can be used as the ground connection. After removing the signal from the J3 (FWD
OUT/RVS IN) port of the Distribution Line Amplifier Assembly verify that J4-3 is < 0.7 VDC. If
J4-3 is > 0.7 VDC and the Distribution Line Amplifier has not been tested for the forward
direction, perform the steps outlined in section 2.5 for the PA input alarm adjustment. If after
completing the amplifier setup procedure the input alarm is not < 0.7 VDC with no input to J4,
the amplifier should be replaced. Contact Andrew for additional information.
2.5.3.3.3

PA Output Signal Alarm

Attach a voltmeter to TP1 on the Alarm I/O relay board (PA output alarm test point). TP1 or
TP2 can be used as the ground connection.
OUT/RVS IN) port of the Distribution Line Amplifier Assembly, verify that J4-1 is < 0.7 VDC. If
J4-1 is > 0.7 VDC and the Distribution Line Amplifier has not been tested for the forward
direction, perform the steps outlined in section 2.5 for the PA output alarm adjustment. If after
completing the amplifier setup procedure the input alarm is not < 0.7 VDC with the expected
input to J4, the amplifier should be replaced. Contact Andrew for additional information.
2.5.3.4

Reverse LNA Channel Verification

Set the DLA direction to the reverse direction.
2.5.3.4.1

LNA Output Level Verification

Attach either a signal generator (frequency = 2467 MHz) or a MDR to J4 (FWD IN/RVS OUT)
port of the Distribution Line Amplifier Assembly. Adjust the signal generator or BDR signal
level at J4 to -50 dBm ± 1 dB. Using a power meter verify that the signal level at the J3 (FWD
OUT/RVS IN) port of the Distribution Line Amplifier Assembly equals G
G is equal to the expected gain of the LNA channel. If the gain is not equal to G
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dB and the Distribution Line Amplifier has not been tested for the forward direction, perform
the steps outlined in section 2.5 for the LNA output adjustment. If after completing the
amplifier setup procedure the output level of the LNA channel is not G
external test measurement cable losses are accounted for, the amplifier should be replaced.
Contact Andrew for additional information.
2.5.3.4.2

LNA Output Signal Alarm

This step assumes that the LNA output level has been set as explained in section 2.5.3.2.1
Attach a voltmeter to J4-2 on the Alarm I/O relay board (PA output alarm test point). TP1 or
TP2 can be used as the ground connection. Remove the pilot tone cable from the LNA
module J5 Aux RF IN port. Verify that J4- on the Alarm I/O relay board is < 0.7 VDC. If J4-2
is > 0.7 VDC, perform the steps outlined in section 2.5 for the LNA output alarm adjustment.
If after completing the amplifier setup procedure the output alarm is not < 0.7 VDC with the
previously set input level to J3, the amplifier should be replaced. Contact Andrew for additional
information.
Document use is restricted to that described on cover
After removing the signal from J3 (FWD
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INSTALLATION
dBm ± 1 dB where
dBm ± 1
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dBm ± 1 dB and all
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