554 Chapter11
Synthesizer Section
Unlocked YTO PLL
Figure 11-7 Troubleshooting an Unlocked YTO PLL
5. Calculate the YTO frequency error by subtracting the frequency
recorded in step 3 from the frequency recorded in step 4. Record the
result below:
YTO frequency error = YTO frequency
(MEASURED)
−YTO
frequency
(CALCULATED)
6. On the spectrum analyzer, press MORE 1 OF 2, FREQ
DIAGNOSE, and FRAC N FREQ. Record the fractional N frequency
below:
7. If the YTO frequency error recorded in step 5 is greater than
20 MHz, do the following:
• Check the YTO adjustments using the automated adjustment in
Chapter 2 or the manual adjustment in Chapter 3.
YTO Frequency Error = _______________________MHz
Fractional N frequency = _______________________MHz
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