N9030B PXA Signal Analyzer Service Guide 193
RF Section Troubleshooting (Millimeter-Wave Analyzers)
Troubleshooting
Troubleshooting a High Band Problem
Refer to the RF Highband Path #1 Block Diagram (Option 544, 550) in Chapter
13and follow the instructions in the settings box. To enable the internal
4.8 GHz, −28 dBm calibrator signal press Input/Output, RF Calibrator, 4.8
GHz.
A13 Front End Input Verification
Disconnect W62 (if Option LNP and/or MPB is installed) or W57 (if neither Opt
LNP nor MPB are installed) from A13A1J9 See Figure 5-7 for location of
connector. Loosen the other end of W62 or W57 if possible to avoid damaging
the cable. Attach a right angle SMA adapter to W62 or W57 and measure the
input to the A13 Front End with a spectrum analyzer.
Figure 5-7 A13A1J9 Location
Expected signal is 4.8 GHz at −51 dBm ± 4 dB. The tolerance is large because
the A12 YTF (microwave preselector) loss varies between devices, and the YTF
may not be perfectly aligned, or the frequency response adjustment may be
required.
If the signal level is incorrect, and Option MPB (Microwave Preselector Bypass)
is installed, press Amplitude, More, uWPath Control, uW Preselector Bypass.
If the signal level is now −52 dBm, suspect the A12 YTF is out of adjustment or
faulty.
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