Amps Receiver Check From Rf To Iq - Nokia 2125 Troubleshooting Manual

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AMPS Receiver Check from RF to IQ

Use the following steps to check the AMPS receiver functionality from RF to IQ output.
1. Start Phoenix in Local Mode with only the Rx path turned on.
2. Inject a –75 dBm CW signal of 881.53 MHz (i.e., 10 kHz offset from 881.52 MHz)
into the RF.
3. Measure a 10 kHz tone on the analyzer. You should see a typical -20 dBm IQ tone
for AMPS.
Figure 15 shows the AMPS spectrum with an inject tone at -75 dBm, 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.
ISSUE 1 08/2005
Figure 14: Receiver IQ Level on AMPS band
©2005 Nokia Corporation
2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting
Company Confidential Page 19