Checking Amps From Rf To Iq - Nokia 6265 Rf Description And Troubleshooting

Nokia Customer Care

Checking AMPS 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 –75dBm CW signal of 881.53MHz (i.e. 10kHz offset from 881.52MHz).
3. Measure a 10kHz tone on the analyzer. You should see a typical -20Bm IQ tone
for AMPS.
Amps I Q Output
dBm
Trace A
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
Centre: 10 kHz
Res BW: 300 Hz
5/5/2004 3:47:21 PM
Figure 27 shows the AMPS spectrum and the test points located on the top side of the
PWB. All four test points should be approximately equal. WARNING: Direct current is
Issue 1 11/2005
1
Atten: 10 dB
Vid BW: 300 Hz
AmpsIQ.spt
Figure 26: Receiver IQ Level on AMPS band
©2005 Nokia Corporation
6265/6265i/6268 (RM-66)
RF Description and Troubleshooting
1
Span: 20 kHz
Sweep: 1 s
HP8595E
Company Confidential
Trace A
11 kHz
-20.3400 dBm
Page 33