User Guide

Nokia Customer Care Troubleshooting - RF
6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)
Issue 1 - Revision 002 09/2004 ©2004 Nokia Corporation Company Confidential Page 53
PCS UHF LO Channel 600 Spectrum
Measure the signal purity of the UHF LO and check the spur level offset from the carrier.
Also, check the VCO, PLL IC, loop filter, and power supply decoupling.
Key observations:
• Clean and spur-free signal
• 30kHz offset -84dBc
• 50kHz offset -87dBc
• 60kHz offset -85dBc
• 90kHz offset -88dBc
Figure 45: PCS UHF LO channel 600 typical spectrum
Note: The view in Figure 45 maybe difficult to accomplish without a high impedance probe and a high
dynamic range spectrum analyzer.
Cell UHF LO Channel 384 Spectrum
Measure the signal purity of the UHF LO and check the spur level offset from the carrier.
Also, check the VCO, PLL IC, loop filter, and power supply decoupling.
Key observations:
• Clean and spur-free signal
• 30kHz offset -83dBc
• 50kHz offset -92dBc