Keysight Technologies N9040B UXA Signal Analyzer Service Guide 239
Hardware Options
A21 Wideband Analog IF Troubleshooting
A21 Wideband Analog IF Troubleshooting
A21 Wideband Analog IF Assembly Description
The analyzer's RF input signal is down converted to a 250 MHz, 750 MHz, or
877.148 MHz intermediate frequency by the A13 Front End assembly and
routed through the A15 Front End controller to A15J901. Cable W41 connects
to A21J17 Wideband Analog IF Input. The signal is filtered, attenuation and
gain applied based upon the instrument settings. This signal is then sampled
by the ADC and the resultant data is the sent to the A22 Wideband Digital IF
(Option B2X) for processing via the flex circuit cable. If the instrument has
Option B5X, 510 MHz Analysis BW, the resultant data is sent to the A22 and
A23 Wideband Digital IF boards.The A22 and A23 Wideband Digital IF have no
service accessible locations and should be troubleshot from the front panel
controls.
If the analyzer is using the Option B40, 40 MHz IF Path, the signal at 250 MHz
IF frequency is switched to J18 and this 250 MHz IF is routed through W40 to
the A3 Digital IF assembly.
If the analyzer is using the Option B2X, 255 MHz IF Path, the signal at J17 will
be at 750 MHz. If the analyzer is using the Option B5X, 510 MHz Path, the
signal at J17 will be 877.148 MHz. Both of these IF signal frequencies are
processed through the A21 Wideband Analog IF assembly.
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