188 Keysight N9038A MXE Service Guide
RF Preselector Section
RF Preselector Section Troubleshooting
22.Verify that the signal level on the spectrum analyzer increases by at least
20 dB from where it was, as shown in Figure 5-15.
If the signal level is incorrect the most likely cause of the problem is the
A21 RF Preselector Input assembly itself. However, if there is no RF
Preselector alignment data the signal level when the preamplifier is turned
on could also be low. Before replacing the A21 RF Preselector Input
assembly for a low preamplifier level try running the alignment routine by
pressing System, Alignments, More, RF Preselector, Align Now, 30 MHz
to 3.6 GHz. Once the alignment is completed check the level again.
Figure 5-15 A21 RF Preselector Input Assembly - Radiated Band Preamp
Alignment Signal Generation
There are two alignment signals generated on the A21 RF Preselector Input
assembly to be verified, a Direct Digital Synthesizer and a Broad Band Noise
Source, as seen in Figure 5-16.
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