User's Manual

SECTION 4: FACTORY TEST PROCEDURE
M64450G25-FCCRpt.doc Page 32
Audio AC and DC Voltages and Balances
Perform the following steps to adjust the Receiver Audio AC and DC voltages and balance:
Step 1 Set the Service Monitor, as follows:
- Select the "RX" function
- Set "RF Gen Freq" to the receive frequency of the mobile radio under test
- Set the Service Monitor to display DC volts and AC Volts
- Connect an oscilloscope 1x probe from TP1 on the base station control board to
the “audio in” connector on the Service Monitor
- Set other values as follows:
Amplitude: -80 dBm 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 2 Adjust 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
- At TP1, measure AC and DC volts
- Adjust RV5 for an AC reading of 400 mVAC +/- 1mVAC
- Adjust RV6 for a DC reading of 2.500 mVDC +/- 1mVDC
- Record AC and DC levels on the Tune and Align Data Sheet
Step 3 Adjust Receiver 2, as follows:
- Connect an RF cable from the Service Monitor's RF Out port to the antenna
port of Receiver 2
- In IPMessage, type the command “receiver = 2” and observe that Receiver 2
is selected
- At TP1, measure AC and DC volts
- Adjust RV3 for an AC reading of 400 mVAC +/- 1mVAC
- Adjust RV4 for a DC reading of 2.500 mVDC +/- 1mVDC
- Record AC and DC levels on the Tune and Align Data Sheet