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

Nokia Customer Care
Figure 30 shows the AMPS 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.
Figure 30: AMPS spectrum and the test points on the top side of the main PWB

Checking Cell Receiver from RF to IQ

Use the following values to check the Cell receiver functionality RF to IQ output.
1. Start Phoenix in Local Mode with only the Rx path turned on.
2. Inject a –75dBm CW signal of 881.82MHz (i.e. 300kHz offset from 881.52MHz or
10 channels away).
Issue 2 05/2005
Figure 29: Receiver IQ Level on AMPS band
©2005 Nokia Corporation
6255/6255i/6256/6256i (RM-19)
RF Description and Troubleshooting
Rx_IP
Rx_IN
Company Confidential
Rx_QP
Rx_QN
Page 39