Nokia 2255 Manual
Also see for 2255: User guideUser guideAntenna Description and TroubleshootingBaseband Description and TroubleshootingDisassembly/Assembly
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Nokia Customer Care RF Description and Troubleshooting2255 (RM-97)ISSUE 1 10/2005 ©2005 Nokia Corporation Company Confidential Page 27Cell Receiver Check from RF to IQUse the following values to check the CDMA Cell Rx functionality from RF to IQ output.1. Start Phoenix in Local Mode with only the Rx path turned on.2. Inject a –75dBm CW signal for Cell 881.82MHz or 881.22 (CH-384 offset by300KHz from 881.52MHz or 10 channels away).3. Measure a 300kHz tuning on the analyzer. You should see a typical -21dBm IQtuning for CDMA Cell.Figure 24 shows the Cell spectrum with an inject tone at -75dBm, as well as the IQoutput test points. Note that DC is present on the IQ output test points, and all testpoints should be approximately equal.Figure 24: Cell spectrum (left) and IQ output test points (right)+615kHz-615kHz CH384881.52MHz300kHzCH394881.82MHzCDMA Cell SpectrumCDMA Cell Spectrum+615kHz-615kHz CH384881.52MHz300kHzCH394881.82MHzCDMA Cell SpectrumCDMA Cell SpectrumRx IPRx INRx QNRx QP |
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