Troubleshooting
Troubleshooting Harmonic Spurious
1-63
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
• ALC Off
• Amplitude Power Search (softkey)
2. Remove the cable from the A30 Modulation Filter J2 (W31). Connect the spectrum analyzer to
A30 Modulation Filter J2.
Table 1-41
Harmonic Specifications
2nd harmonic
≤-15 dBc
3rd harmonic
≤-10 dBc
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