198 Keysight N9038A MXE Service Guide
RF Preselector Section
RF Preselector Section Troubleshooting
11.Tune the signal generator to the Center Frequency listed in Table 5-8 for
Band 0.
12.Place one of the active traces on the spectrum analyzer into its Max Hold
function.
13.Slowly vary the frequency of the signal generator above and below the
Center Frequency listed in Table 5-8 to draw out the shape of the selected
filter on the spectrum analyzer display, as shown in Figure 5-22.
14.Verify that the passband gain or loss is equal to the Typical Passband
Gain/Loss shown in Table 5-8 for Band 0, and that the filter shape is
similar to that shown in Figure 5-22.
If either the passband gain/loss or filter shape is incorrect the most likely
cause of the problem is the A22 Radiated Filter assembly itself. However,
before replacing the A22 Radiated Filter assembly be sure to perform the
Characterize Preselector routine for the band exhibiting an alignment
problem. The Characterize Preselector routine can be found in the
instrument Service Menu under System, Service, RF Preselector,
Characterize RF Preselector, All Bands. See Chapter 16, “Service and
Diagnostics Menus” for details.
15.Repeat step 8 through step 14 for the remained of the A22 Radiated Filter
assembly filter bands shown in Table 5-8, using the Center Frequency,
Span, and Typical Passband Gain/Loss shown in Table 5-8 for each band.
Table 5-8 A24 Conducted Filter Assembly - Filtered Signal Paths
Service Menu
Selection
Frequency Range Center Frequency Span Typical Passband
Gain/Loss
Band 0 30 MHz to 70 MHz 50 MHz 30 MHz +4.0 dB
Band 1 70 MHz to 150 MHz 100 MHz 50 MHz +4.0 dB
Band 2 150 MHz to 300 MHz 200 MHz 100 MHz +4.0 dB
Band 3 300 MHz to 600 MHz 500 MHz 200 MHz +6.0 dB
Band 4 600 MHz to 1 GHz 800 MHz 200 MHz +6.0 dB
Band 5 1 GHz to 2 GHz 1.5 GHz 300 MHz +6.0 dB
Band 6 2 GHz to 3.6 GHz 2.55 GHz 2.1 GHz +10.0 dB
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