User Guide

NHM-4
CCS Technical Documentation
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Apply –90dBm
Oscilloscope at RX_I
1842.86771 MHz signal from
generator to antenna connector
Signal 700mVpp
DC offset 1.35V
Frequency 67.7 kHz
Change
generator
level
to –50 dBm
Spectrum
1800 LNA out
-61 dBm
analyzer
Spectrum
1800 1st SAW
-77 dBm
analyzer
Spectrum
1800_RX
-78 dBm
analyzer
Check
antenna switch
Z500
Check
dual RX SAW
Z520
Oscilloscope
LNA_P 0V
LNAB_P 2.7V
No
Yes
No Yes No
No
Spectrum
V550, RFout
-58 dBm
analyzer
Check
V550, C551
L552
Oscilloscope
V550, RFout 2.6V
Check
V550, R551,
L550, R558
Yes
Check
baseband
Check
HAGAR N600
Yes
No
Check
C552
Yes
Yes
Oscilloscope
VR4 2.7V
Check HAGAR
serial interface.
check R501
No
Yes
No
Yes
Spectrum
1800 bal out
-66 dBm
analyzer
Yes
Check
Z551,C555
C556, L551
Oscilloscope
VR4 2.7V
Check HAGAR
serial interface.
(burst mode)
Check
baseband
Spectrum
4G VCO out
3685.6 MHz
analyzer
-30 dBm(*
Synthesizer
troubleshooting
Check
HAGAR N600
Yes
No
No
No
Note:
All spectrum analyzer
reading values are
measured with 1 kOhm
passive probe
(use tweezers to connect
the probe ground to the
nearest PWB ground)
Reading value is represented
without +26dB compensation.
*When 1kOhm passive probe is used,
correct measurement result by +26dB
V550, RFin 0.8V
out
Yes
GSM1800 RX
chain
functional