Nokia 2255 Manual page 37

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6. Type 10, 13, 12, and 8 in the fields in the PIN # column.
Change to
GenIO Output
and set to High
7. Click the Get All button.
8. Change the value for Pin 8 in the Source column to GenIO Output.
9. Ensure that all of the pins have a value of H in the State column. (Click the L
values to change them to H values.)
10. The next step depends on the type of measurement equipment you are using:
• HP4406 or a spectrum analyzer: Set the center frequency to 836.52MHz and
the span to 2MHz. Also, establish a marker at 836.52MHz.
• HP8960: Set the callbox state to AMPS, and set the channel to 384. Use the
Frequency Accuracy measurement to center the VCTCXO.
11. Adjust the AFC value to center the VCTCXO on the RF PDM dialog box. The
tuning range is approximately +/- 10kHz.
ISSUE 1 10/2005
Figure 34: General I/O dialog box for VCTCXO tuning
©2005 Nokia Corporation
RF Description and Troubleshooting
Company Confidential
2255 (RM-97)
Page 37