User's Manual

SECTION 4: FACTORY TEST PROCEDURE
M64450G25-FCCRpt.doc Page 33
Receiver Calibration
Each receiver must be calibrated at four (4) points to ensure the proper operation of Intelligent Diversity
Reception and to provide the IPNC with correct information about the signal strength of received mobile
data.
Step 1 Connect a coaxial cable from the Service Monitor “RF Input” port to a receiver
port on the base station
Step 2 Set the Service Monitor
Step 3 Select the "RX" function
Step 4 Set the "RF Gen Freq" to the receive frequency of the mobile radio under test
Step 5 Connect an oscilloscope 1x probe from TP1 on the base station control board to
the “audio in” connector on the Service Monitor
Step 6 Set other values as follows:
Amplitude: varies AFGen1 Freq: 1.000 kHz AFGen2 Freq: 1.000 kHz
Atten Hold: Off AFGen to: FM 5 KHz AFGen2 to: Off
Output Port: RF Out Ext Load R: 600 ohm
Filter 1: 300 Hz HPF
Filter 2: 3 kHz LPF
Step 7 Calibrate Receiver 1, as follows:
- Connect an RF cable from the Service Monitor's RF Out port to the
antenna port of Receiver 1
- In IPMessage, type the command “receiver = 1” and observe that
Receiver 1 is selected
- Set the Service Monitor to measure 12db SINAD
- Reduce signal amplitude on the Service Monitor until 12dB SINAD is
reached. Record this value
- In IPMessage, type the command “12DB SINAD = “ and the recorded
value
- Set the Service Monitor to measure SNR
- Increase signal amplitude until reaching a level of 30dB SNR
- Record the amplitude
- In IPMessage, type the command “30DB S/N = “ and the recorded value
- Increase signal amplitude until reaching 40dB SNR
- Record the amplitude
- In IPMessage, type the command “40DB S/N = “ and the recorded value
- Set the signal amplitude to -40dBm
- In IPMessage, type the command “-40DBM = -40“