User Manual

SECTION 2: FACTORY TEST PROCEDURE
~\Technical Documentation\System Manuals\FCC-Reports\DT450-FCCRpt.doc Page 13
Step 5 Adjust each pole of filters (FT3A and FT2A) for maximum RSSI voltage. Go back and
forth between these adjustments until no further increase is noted.
Step 6 Adjust the trimmer capacitor (CV1A) for maximum RSSI voltage. Record this value on
the Mobile Data Radio Performance Test Data Sheet.
Step 7 Connect the scope probe to the service monitor’s audio input.
Step 8 Connect the probe to test point (TP1) in the radio. This looks at the 1 KHz recovered
audio output. Record this value on the Mobile Data Radio Performance Test Data
Sheet.
Step 9 Check to ensure the distortion reading on the monitor is 3% or less. If necessary, adjust
trimmer capacitor (CV1A) for minimum distortion.
Step 10 Select the SINAD measurement on the service monitor and read the results. SINAD
should be 12 dBm or better for an RF input of –119 dBm.
Step 11 Read the level of the recovered modulation at TP1.
Step 12 Move the DMM test probe to TP1.
Step 13 Adjust pot R19A for a reading of 2.500 VDC (+/-10 mV) on the DMM.
Step 14 The previous two (2) adjustments are interactive. Repeatedly adjust R19A until you
obtain 340 mV RMS and 2.500 VDC. Record this value on the Mobile Data Radio
Performance Test Data Sheet.
Receiver 2
Step 1 Ensure the RX TEST function is in use on the service monitor. Move the RF jumper
cable to the radio’s RX2 antenna input.
Step 2 Move the DMM test probe to test point RSSI2.
Step 3 Verify the scope test probe is still connected to test point TP1.
Step 4 Adjust each pole of filter (FT4B) for maximum RSSI voltage. Go back and forth between
these adjustments until no further increase is noted.
Step 5 Adjust each pole of filters (FT3B and FT2B) for maximum RSSI voltage. Go back and
forth between these adjustments until no further increase is noted.
Step 6 Adjust the trimmer capacitor (CV1B) for maximum RSSI voltage.
Step 7 Check to ensure the distortion on the monitor reads 3% or less. If necessary, adjust
trimmer capacitor (CV1B) slightly to get it under 3%. Record this value on the Mobile
Data Radio Performance Test Data Sheet.