User Guide

PAMS Technical Documentation Trouble Shooting
NHM-3
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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
C504
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
R803 & C807
TXBUF_G
Vdc > 2.0 Volt No Check:
PA N800, pin 2
TXVGSM
Vdc > 2.0 Volt Hagar Serial Interface
PA N800, pin 1
TXVPCN
Vdc < 0.3 Volt Hagar
C802
TXVDET
Vdc > 2.0 Volt
Yes
Spectrum analyser Check:
C821 & L806 No Synthesiser
Power > 0 dBm, 897,6 MHz Hagar
Yes
Spectrum analyser Check
C818 & R820 No EGSM TX SAW Filter
Power > -3 dBm, 897,6 MHz Z802
Yes
Spectrum analyser Check
C809 & Z800 No EGSM TX Buffer, V801
Power > +4 dBm, 897,6 MHz
Yes
Spectrum analyser Check
PA N800, pin 8 No Diplex Filter Z800
Power > +1 dBm, 897,6 MHz
Yes
Use Wintesla to select
TX_Data Type: Random
TX Power Level: 10
Yes
Spectrum analyser Check PA N800
PA N800, pin 4 No Check Power Loop
Power = +21 dBm, 897,6 MHz Check TXC
Yes
Spectrum analyser Check
RF-connector No Directional Coupler (L800)
Pout = +23 dBm, 897,6 MHz RX/TX Switch (Z900)
Yes
EGSM TX
OK