Tx Uhf Lo (N7000) Troubleshooting; Typical Transmitter Uhf Lo Spectrum Outputs - Nokia 6235 Troubleshooting Manual

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Tx UHF LO (N7000) Troubleshooting

There are two fixed LOs, 3296.16~3395.88MHz for cell band and 3700~3819.90MHz for
PCS band. This is the only LO for up-conversion. Be sure to monitor the control voltage at
R7001. When the N7000 LO is locked, this control voltage should be between 1.2 and
1.8Vdc.

Typical Transmitter UHF LO Spectrum Outputs

Figure 58: Transmitter UHF LO (3296.16~3395.88)/4 MHz Output for Cell
Issue 1 04/2005
Figure 57: Tx UHF LO layout and test points
©2005 Nokia Corporation
6235/6235i/6236i (RM-60)
RF Description and Troubleshooting
Keys observations:
- the following Ref Spurs
- 30kHz offset –65dBc
Company Confidential Page 59