PAMS Technical Documentation
Trouble Shooting
NHM-3
2ULJLQDO
1RNLD0RELOH3KRQHV/WG
3DJH
)DXOWILQGLQJFKDUWIRU(*60UHFHLYHU
)
D
X
O
W
I
L
Q
G
(*606LJQDOSDWK
)RUHDV\HUURUWUDFLQJLWLVLPSRUWDQWWRNQRZWKHVLJQDOSDWKRIWKH(*60UHFHLYHU7KH
FRPSRQHQWVFDQEHJURXSHGLQWREORFNVDQGGUDZQDVVKRZQEHORZ
946.267MHz signal from
generator to antenna
connector
Oscilloscope at RXI
Signal 680 mVpp
DC offset 1,1V
Frequency 67,7kHz
EGSM chain functional
Oscilloscope
VRX 2.7V
Check Hagar serial
interface
Yes
Yes
Yes
Spectrumanalyzer
V700, RFout
-60dBm
No
No
Spectrumanalyzer
1st EGSM SAW
out
-78dBm
GSM_RX
-77 dBm
No
Spectrumanalyzer
T700, unbal
-66dBm
Check
C713, Z703, R711
No
Yes
Check BB
No
Oscilloscope
LNA_G 2.4-2.8V
LNAB_G 0V
Yes
Check RX/TX
Switch
Z900
No
Check Z700
Yes
No
Oscilloscope
V700, RFout 2.1-2.2V
V700, RFin 0.8-0.9V
Yes
Oscilloscope
VRX 2.7V
Check Hagar serial interface
Check Hagar
N500
Yes
Check BaseBand
No
Check
R706, R708, V700
No
Check
V700
Yes
Change generator
level to -55dBm
Yes
2
2
2
2
INP_P_RX
INM_P_RX
R
X
/T
X Sw
it
c
h
RX
RX
TX
TX
INP_G_RX
INM_G_RX
DNC2
DNC2
LNA_P
RXQ
RXI
OU
T
_
BB1_I
OU
T
_
BB1_Q
I_
DCN2
_
I
I_
DCN2
_
Q
C
1_BB1_I
C
2_BB1_I
C
2_BB1_Q
C
1_BB1_Q
C
p_f
_I
C
m
_f
_I
C
p_f
_Q
C
m
_f
_Q
C
p_dt
os
_I
C
m
_dt
os
_I
C
p_dt
os
_Q
C
m
_dt
os
_Q
0-40dB
BB_Gain
0-40dB
BB_Gain
DtoS
DtoS
BIQUAD
BIQUAD
GSM
PCN
VR
F
_
R
X
VREF_RX
VB_EXT
R
B
_EXT
RF
Controls
8 / 18 dB
8 / 18 dB
SAW
SAW
SAW
SAW
LNA
LNA
Hagar
VRF_RX
VREF_RX
VREF
RXI
RXQ
Ant
enna c
onnec
to
r
LNA_G
LNAB_D
LNAB_G
(*605HFHLHYHU)DXOW7UHH
