Checking Pcs Receiver From Rf To Iq - Nokia 3155 Rf Description And Troubleshooting

Nokia Customer Care

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 5dBm IQ tone for CDMA PCS.
Figure 31 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 1 07/2005
Figure 31: Receiver IQ Level on PCS Band
©2005 Nokia Corporation
3155/3155i (RM-41), 3152 (RM-61)
RF Description and Troubleshooting
Company Confidential
2 2
Trace A Trace A
503 kHz 503 kHz
5 dBm 5 dBm
Page 37