Nokia RH-57 Series Troubleshooting Manual page 12

2112 (RH-57)
Troubleshooting - RF
Figure 9 shows each testing point for the PA section from Table 1, "Cell Transmitter Test
Points," on page 9. Always attach a 20 dB pad (11881-60001) when probing with an
HP85024A high frequency probe.
Figure 9: (Top) PWB. (Bottom left) A zoomed view of the testing points on the PA section.
(Bottom right) A zoomed view of the PA section with part numbers.
Tx AGC Tuning
Tx power versus IF/RF PDM can be verified against FlaLi specification limits. Make sure
that the PA is set in high gain mode (GenIO bits 10, 13, and 12 are set to H).
Tx Tuning
AGC Step
Tx AGC (0)
Tx AGC (1)
Tx AGC (2)
Tx AGC (3)
Tx AGC (4)
Tx AGC (5)
Page 12
Table 2: Tx AGC Tuning Steps
Tx AGC
PDM Value
308
130
85
51
19
-5
©2004 Nokia Corporation
Target Low High
Power Limit Limit
-46 -55 -37
-24 -34 -14
-15 -25 -6
-4.5 -14 5
2.5 -7 12
6 -3 15
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Nokia Customer Care
Issue 1 07/2004