Keysight Technologies N9030B Service Manual page 197

RF Section Troubleshooting (Millimeter-Wave Analyzers)
Troubleshooting
RF = LO x N − IF
IF = LO x N − RF
LO x N = IF + RF
For input signal frequencies above 8.4 GHz to 50 GHz:
RF = LO x 2 x N − IF
IF = LO x 2 x N − RF
LO x 2 x N = RF + IF
Low Noise Path (Option LNP)
Allows the Lowband Switch assembly to be bypassed, improving sensitivity in
highband path.
Press Amplitude, uW Path Control, Low Noise Path Enable key. The Low
Noise Path will be enabled only after the following conditions are met:
1. The start frequency must be 3.6 GHz or greater.
2. The high band preamp (option P08, P18, P26, P43, P44, P50) must be Off.
When Switch 3 changes state, you will hear a click. The amplitude of the
displayed signal should not change.
Microwave Preselector Bypass (Option MPB)
Allows the YTF to be bypassed improving amplitude accuracy.
Assure start frequency is 3.6 GHz or greater. Press Amplitude, uW Path
Control, uW Preselector Bypass. When the bypass switch, Switch 4, changes
state you will hear a click. Depending on the signal source connected, you may
see many "signals" appear on screen because without preselection, the
analyzer will display images and multiples. The real input signal should not
change amplitude when you switch the uW Preselector Bypass on and off.
N9030B PXA Signal Analyzer Service Guide
where RF is the input signal at the signal analyzer
where N is the harmonic mixing mode:
N = 1 for 3.5 GHz to 8.4 GHz
where RF is the input signal at the signal analyzer
where N is the harmonic mixing mode:
N = 1 for 8.4 GHz to 17.1 GHz
N = 2 for 17.1 GHz to 34.0 GHz
N = 4 for 34.0 GHz to 50 GHz
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