Pcs Uhf Lo Ch600 Typical Spectrum; Rho And Uhf Lo - Nokia 6265 Rf Description And Troubleshooting

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PCS UHF LO CH600 Typical Spectrum

TX VHF LO for PCS Band
dBm
Trace A
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
Centre: 2.088100 GHz
Analyzer Settings:
Res BW: 300 Hz
9/23/2003 3:26:23 PM
Center: 2088.1MHz Span: 200kHz
RBW: 30Hz

Rho and UHF LO

Measure the signal purity of the UHF LO, checking the spur level offset from the carrier.
Also check the VCO, PLL IC, loop filter and power supply decoupling.
Following are the keys observations:
• Clean and spur-free signal
• 30kHz offset –84dBc
• 50kHz offset –87dBc
• 60kHz offset –85dBc
• 90kHz offset –88dBc
Note: A High Impedance probe and high dynamic range spectrum analyzer are required
for Figure 48.
Issue 1 11/2005
Offset
50kHz
1-1
Vid BW: 300 Hz
Figure 48: PCS UHF LO Typical Spectrum
©2005 Nokia Corporation
6265/6265i/6268 (RM-66)
RF Description and Troubleshooting
Spur
-87dBc
2-1
4-1
3-1
5-1
Span: 200.000000 kHz
Sweep: 6 s
HP8562E,007
VBW: 30Hz
Company Confidential
1-1
Trace A
2.088100 GHz
-10.6600 dBm
2-1
Trace A
30.000000 kHz
-84.3400 dB
3-1
Trace A
50.000000 kHz
-87.3400 dB
4-1
Trace A
60.000000 kHz
-85.3400 dB
5-1
Trace A
90.000000 kHz
-87.8400 dB
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