Tx Agc Tuning - Nokia RH-77 Troubleshooting Manual
Rf description and troubleshooting
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Also See for RH-77:
- Manual (12 pages) ,
- Troubleshooting manual (8 pages) ,
- Disassembly/assembly (8 pages)
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Figure 9
shows each testing point for the PA section from
Points," on page 8. 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)
Issue 01 04/2005
Table 2: Tx AGC Tuning Steps
Tx AGC
PDM Value
308
130
85
51
19
-5
©2005 Nokia Corporation
RF Description and Troubleshooting
Table
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
Company Confidential
2118 (RH-77)
1, "Cell Transmitter Test
Page 11
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