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PAMS Technical Documentation
Trouble Shooting
NHM-3
2ULJLQDO
1RNLD0RELOH3KRQHV/WG
3DJH
)DXOWILQGLQJFKDUWIRU3&1WUDQVPLWWHU
Oscilloscope
R515
VREF
Vdc = 1.5 Volt
Check
R810 & R811
VTX
Vdc = 2.7 Volt
No
BaseBand
C524
TXP
Vdc > 2.5 Volt
C500
VRX
Vdc = 2.7 Volt
C511
VSYN_2
Vdc = 2.7 Volt
C513
VXO
Vdc = 2.7 Volt
Yes
Oscilloscope
R516 & C525
TXQ_0
Vac = 0.4 Vpp, Vdc = 0.8 V
No
Check
R516 & C525
TXQ_180
Vac = 0.4 Vpp, Vdc = 0.8 V
BaseBand
R513 & C525
TXI_0
Vac = 0.4 Vpp, Vdc = 0.8 V
R513 & C525
TXI_180
Vac = 0.4 Vpp, Vdc = 0.8 V
Yes
Oscilloscope
R802 & C829
TXBUF_P
Vdc > 2.0 Volt
No
Check:
PA N800, pin 2
TXVGSM
Vdc < 0.3 Volt
Hagar Serial Interface
PA N800, pin 1
TXVPCN
Vdc > 2.0 Volt
Hagar
C802
TXVDET
Vdc > 2.0 Volt
Yes
Spectrum analyser
Check:
C819 & C823
No
Synthesiser
Power > 0 dBm, 1747,6 MHz
Hagar
Yes
Spectrum analyser
Check
C828 & Z800
No
PCN TX Buffer, V802
Power > +6 dBm, 1747,6 MHz
Yes
Spectrum analyser
Check
PA N800, pin 8
No
Diplex Filter Z800
Power > +3 dBm, 1747,6 MHz
Yes
Use Wintesla to select
TX_Data Type: Random
TX Power Level: 5
Yes
Spectrum analyser
PA N800, pin 5
No
Check PA N800
Power = +18 dBm, 1747,6 MHz
Check Power Loop
Yes
Check TXC
Spectrum analyser
Check
RF-connector
No
Directional Coupler (L800)
Power = +20 dBm, 1747,6 MHz
RX/TX Switch (Z900)
Yes
PCN TX
OK