User Guide

6235/6235i/6236i (RM-60)
RF Description and Troubleshooting
Page 54 ©2005 Nokia Corporation Company Confidential Issue 1 04/2005
UHF Synthesizer Test Points
Figure 51: UHF synthesizer layout
Typical UHF LO Spectrum Outputs
When analyzing the specturm ouputs, first measure the purity of the UHF LO, then look
at the level offset from the carrier. Also check the VCO, PLL IC, loop filter and power
decoupling. The results in Figure 52 and Figure 53 may be difficult to accomplish without
a high impedance and high spectrum analyzer.