Checking Pcs Receiver From Rf To Iq - Nokia 6255 Rf Description And Troubleshooting

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Checking PCS Receiver from RF to IQ

Use the following values to check the PCS receiver 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 of 1960.5MHz (i.e. 500kHz offset from 1960MHz or
10 channels away).
3. Measure a 500kHz tone on the analyzer. (If a 300kHz tone works but a 500kHz
tone does not, the problem is in the BB filter, possibly not set by Phoenix.) You
should see a typical -22dBm IQ tone for CDMA PCS.
Figure 33 shows the PCS spectrum and the test points located on the top side of the
main PWB. All four test points should be approximately equal. WARNING: Direct current
is present on these test points.
Issue 2 05/2005
Figure 33: Receiver IQ Level on PCS Band
©2005 Nokia Corporation
6255/6255i/6256/6256i (RM-19)
RF Description and Troubleshooting
Company Confidential Page 41