User Guide

PAMS Technical Documentation 6 - Troubleshooting
NPL-1
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Yes
Oscilloscope
R823 VTXB_900 Vdc = 2.78 Volt No Check:
C702 CONT1 Vdc = 0 Volt Mjoelner Serial
Interface
C701 CONT2 Vdc = 0 Volt Mjoelner
C703 CONT3 Vdc = 2.78 Volt
C803 VBD Vdc = 2.78 Volt
Yes
Spectrum analyzer No Check
Z701 out, R806 in TX_900 P>= -3 dBm, 897,4 MHz EGSM TX SAW Filter
Compare with good sample Mjoelner
Yes Synthesizer
Use Phoenix to select
TX_Data Type: Random
TX Power Level: 10
Yes
Spectrum analyzer Check PA N801
L801 B1_in (PA N801
Pout_GSM)
No Check Power Loop
L801,V801
Power = +25 dBm, 897,4
MHz
Check TXC
Yes
Spectrum analyzer Check
RF-connector No Directional Coupler (L801)
Pout =+23 dBm, 897,4 MHz Antenna Switch (Z601)
Yes
EGSM TX
OK