Nokia RH-77 Troubleshooting Manual page 35

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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.
12. Adjust the AFC value so that the output signal is within +/- 100Hz. If you are
using an HP4406 or a spectrum analyzer, narrow the span to 1kHz or less.
Issue 01 04/2005
Figure 26: Manually adjusting the AFC to center VCTCXO
©2005 Nokia Corporation
RF Description and Troubleshooting
Company Confidential
2118 (RH-77)
Page 35