User Manual

SECTION 2: FACTORY TEST PROCEDURE
~\Technical Documentation\System Manuals\FCC-Reports\DR4B-FCCRpt.doc Page 15
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Step 5 Inject an on-frequency signal at a level equal to Receiver 2 12dB SINAD level, modulated
with a 1 KHz test tone at ±5.0 KHz deviation into Receiver 2.
Step 6 While monitoring TP2 with the digital multi-meter, adjust RSSI2 low adjust potentiometer
(R10) for a reading of 0.750 VDC ±10 mV.
Step 7 Increase the amplitude of the signal by 50 dBm.
Step 8 While monitoring TP2 with the digital multi-meter, adjust RSSI2 high adjust potentiometer
(R9) for a reading of 2.75 VDC ±10 mV.
Adjustments R9 and R10 are interactive adjustments, therefore continue adjustments until the DC voltage
at TP2 is 0.750 VDC for the receiver’s 12 dB SINAD level and 2.75 VDC for a 50 dBm increase from the
receiver’s 12 dB SINAD level.
Step 9 Inject an on-frequency signal at a level equal to Receiver 3 12dB SINAD level, modulated
with a 1 KHz test tone at ±5.0 KHz deviation into Receiver 3.
Step 10 While monitoring TP3 with the digital multi-meter, adjust RSSI3 low adjust potentiometer
(R33) for a reading of 0.750 VDC ±10 mV.
Step 11 Increase the amplitude of the signal by 50 dBm.
Step 12 While monitoring TP3 with the digital multi-meter, adjust RSSI3 high adjust potentiometer
(R35) for a reading of 2.75 VDC ±10 mV.
Adjustments R33 and R35 are interactive adjustments, therefore continue adjustments until the DC voltage
at TP3 is 0.750 VDC for the receiver’s 12 dB SINAD level and 2.75 VDC for a 50 dBm increase from the
receiver’s 12 dB SINAD level.
Step 13 Adjust the carrier detect potentiometer (R74) to illuminate a level of –116 dBm.
Receive Data
Step 1 Using a calibrated mobile radio, generate uplink data messages using the X=2000,19
command in the IP Message Utility program (see the Internet Protocol (IP) Data
Transceiver IP4/IP8 System Manual for instructions).
Step 2 Attach an antenna to one of the base station’s receiver ports and verify on the base
station monitor screen (HyperTerminal) that the received message data quality are
consistently 240 and higher for 2000 character messages. Repeat test for each receiver.
Constant fluctuations in the data quality are indicative of group delay programs. The data
quality readings should always be at or above 240.