Cell Receiver Check From Rf To Iq - Nokia 2255 Manual

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Cell Receiver Check from RF to IQ

Use 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 by
300KHz from 881.52MHz or 10 channels away).
3. Measure a 300kHz tuning on the analyzer. You should see a typical -21dBm IQ
tuning for CDMA Cell.
Figure 24 shows the Cell spectrum with an inject tone at -75dBm, as well as the IQ
output test points. Note that DC is present on the IQ output test points, and all test
points should be approximately equal.
-615kHz -615kHz
CH384 CH384
881.52MHz 881.52MHz
CDMA Cell Spectrum CDMA Cell Spectrum
CDMA Cell Spectrum CDMA Cell Spectrum
Figure 24: Cell spectrum (left) and IQ output test points (right)
ISSUE 1 10/2005
CH394 CH394
881.82MHz 881.82MHz
300kHz 300kHz
+615kHz +615kHz
©2005 Nokia Corporation
RF Description and Troubleshooting
Rx IP
Rx IN
Rx QN
Rx QP
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