Section 5 Total Adjustment
5-12
5.7 A31 CDMA IQ
5.7.1 Setting of measurement system
MT8802A :
MAIN terminal output BAND = 800 MHz Channel = 283
BS Output Level = –18 dBm
MS8606A :
Freq = 878.49 MHz Level = –10 dBm
Signal
Measuring Object : [Forward]
Data Rate : [9600/14400 bps]
Modulation Analysis Length : [10] * 64 PN chips
Filter : [Filter + EQ]
PN Synchronization : [No Sync]
5.7.2 Adjustment
(1) Set the VR 52/53/54/55/67/75 at each the center position.
(2) Press the Start key for setting the Call Processing function of the MT8802A to
Idle state.
(3) Using a personal computer, send the GPIB command of “TESTMODE ∆
INSPECLOOPBACK” for making the Call Processing state to Loop Back.
Using a personal computer, send the GPIB command of “TESTPILOTCH ∆ ON”
for outputting the Pilot signal.
(4) Analyze the modulated signal using the MS8606A etc..
(5) Adjust the VR53 and VR54, alternatively, for making the Origin Offset to less
than –50 dB.
(6) Adjust the VR55 and VR67, alternatively, for making the ρ to more than 0.997.
VR54
VR67
VR55
VR53
VR52
VR75
Front side of MT8802A
Variable resistor
location at top view
when top cover
opened
To Next Page
Loading...
