User's Manual

SECTION 4: FACTORY TEST PROCEDURE
M64450G25-FCCRpt.doc Page 28
Receiver Alignments and Tests
TCXO Operation
Perform the following steps to check the operation of the TCXO:
Step 1 In IPMessage, type “status = pps, cal” in the command field and press [ENTER].
Step 2 Read the reported error values for the TCXOs.
Step 3 Continue using the “status = pps, cal” command, until GPS is acquired.
Step 4 Repeat the command observing the error values.
Step 5 Observe that the TCXO “error ppb” continues to adjust until it settles at +/-200.
Step 6 Enter the “error ppb” data onto the Tune and Align Data Sheet.
Receiver Injection
Perform the following steps to make sure the receiver injection is locked on frequency:
Step 1 Connect a coaxial cable from the Service Monitor “RF Input” port to the “RX2” port on
the mobile radio.
Step 2 Place the Service Monitor in the “Tx” mode.
Step 3 Set the Service Monitor to the base station’s Receiver Injection frequency.
Step 4 Adjust the squelch on the Service Monitor until the frequency error is displayed.
Step 5 When the injection frequency stabilizes record the frequency error on the Tune and
Align Data Sheet.
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At this time the Operator is able to proceed with the other adjustments and
alignments.
45 MHz Filters Waveform
Perform the following steps to set the Waveform for the 45 MHz filters:
Step 1 Set the Service Monitor with the following selections:
- Select the spectrum analyzer function
- Set the center frequency for 45 MHz
- Set the amplitude to -20 dBm
- Set the Span to 100 kHz
- Choose “Controls…RF Gen”
- Set to “Track” to enable the tracking generator
- Set the “RF Gen Freq” to equal the radio receive frequency minus 45 MHz
- Set “Amplitude” to -30 dBm
- Set the “Output Port” to “DUPL” to select the duplex out port
Step 2 Connect a High Frequency Probe to “Ant In” port on the Service Monitor.