User Manual

SECTION 2: FACTORY TEST PROCEDURE
~\Technical Documentation\System Manuals\FCC-Reports\DR4B-FCCRpt.doc Page 16
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Exciter
Step 1 Using the X=2000,19 command, generate data messages so the transmit power and
frequency can be checked.
Step 2 Connect the base stations' transmit port to the HP communication test set. Note the
power level prior to adjusting.
Step 3 On the power amplifier circuit board adjust the potentiometer (RV1) fully clockwise (this
will enable low power transmit operation).
Step 4 While transmitting data messages using the X=2000,19 command, adjust the following:
 TCXO Y1 and R14 for minimum frequency error
 R11 for ±5.0 KHz deviation
Transmit output power should be approximately 1mWatt. The REFMOD adjustment needs to be made
while the base station is transmitting real data messages to and from a mobile radio. This is most easily
done using the ping command to ping the IPNC from a mobile radio. This will cause the base station to
repeatedly send data messages and will facilitate the REFMOD adjustment.
Step 5 Connect the base station to the IPNC.
Step 6 Using a calibrated mobile radio operating on the base station’s channel, adjust R4 for
consistent data quality readings of 248 (as observed on the mobile radio’s attached PC
IP Message window). Access the MSDOS prompt and ping using the following
command:
>;ping 192.168.3.3 –t -l 500 –w 2000
This command will ping the IPNC continuously with a 500-character test message. Press [Ctrl]+C to
stop the ping.
Power Amplifier
Step 1 Connect the base stations' transmit port to the communication test set.
Step 2 Using the X=2000,19 command, generate data messages.
Step 3 Slowly increase the base station output power by turning the power control potentiometer
counterclockwise until the power noted previously or 40 Watts of output power is
obtained or to the level.
Do not exceed 20 watts output power as this will reduce the life of the amplifier module.
Step 4 Perform a close visual inspection of the radio paying close attention to manufacturing
related problems such as loose screws, solder practices, etc.