User Guide

CC Technical Documentation Troubleshooting - GPS

RM-11

3. Measure probe points with either a FET probe and a spectrum analyzer set at

center frequency 1575.25MHz, Span = 500kHz, or a voltmeter as specified. See

Table 1 for measurement information that correspond to the test points in

Figure 9.

Figure 9: GPS RF probing measurements

Table 1 defines the test points shown in Figure 9.

Table 1: GPS RF test point information

Test Point Description Value Instrument

1 LNA output 1575.25MHz @ -19.5dBm spectrum analyzer

2 2nd BPF output 1575.25MHz @ -21dBm spectrum analyzer

3 TXCO supply V

RF_GPS

2.78V (DC) voltmeter

4 TXCO output freq 16.368MHz @ +6dBm spectrum analyzer

1 - Probe one of the two

exposed pads that lead into

the Z001

2 - Probe C014

3 - Probe C015

4 - Probe C029