1-81
Troubleshooting
Troubleshooting Harmonic Spurious
11.If the harmonic level is >–55 dBc, replace the A30 Modulation Filter.
20 GHz Models
Harmonic problems with a fundamental frequency between 3.2 GHz and 20 GHz
1. Set the signal generator as follows:
• Frequency: set to harmonic frequency to be measured
• Amplitude: +10 dBm
•ALC Off
• Amplitude Power Search (softkey)
2. Remove the cable from the A29 20 GHz Doubler J2. Connect the spectrum analyzer to
A29 20 GHz Doubler J2.
3. Set the spectrum analyzer to the harmonic frequency, press marker peak search and then delta
marker.
4. Set the signal generator to the fundamental frequency of the harmonic.
5. Using the delta marker, read the harmonic power level on the spectrum analyzer.
6. If harmonics do not meet specification, replace the A29 20 GHz Doubler.
7. If harmonics meet or exceed specification, reconnect the cable to the A29 20 GHz Doubler J2 and
remove the cable going to the A30 Modulation Filter J2 (W31). Connect the spectrum analyzer to
the
A30 Modulation Filter J2.
8. Set the signal generator and spectrum analyzer to the harmonic frequency. On the spectrum
analyzer, press marker peak search and delta marker.
9. Set the signal generator to the fundamental frequency of the harmonic.
10.Using the delta marker, read the harmonic power level on the spectrum analyzer. Harmonics
should be
≤–55 dBc.
11.If the harmonics do not meet specification, replace the A30 Modulation Filter.
40 GHz Models Only
Harmonic problems with a fundamental frequency between 2 GHz and 20 GHz
1. Set the signal generator as follows:
• Frequency: set to harmonic frequency to be measured
• Amplitude +10 dBm
Table 1-23
Harmonic Specifications
2nd harmonic ≤ –15 dBc
3rd harmonic ≤ –10 dBc
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