Keysight NFA Series Noise Figure Analyzers Service Guide
137
RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
RF Section Description
3. RF input frequencies from 13.6 GHz to 26.5 GHz
go through high band
for details.
This signal level can be optimized by either Input Attenuator A or Input
Attenuator B. The signal is then routed to the low band switch, which will
route the signal to the A12 YTF Preselector.
The low band switch is biased by the A15 Front End Control Assembly. The
signal then routes to the A12 YTF Preselector before going to the A13 RF
Front End Assembly. The input switch in the RF Front End Assembly routes
the RF input signal to Mixer #3. The RF input signal is then mixed with the
1st L.O. from the A14 L.O. Synthesizer Assembly in Mixer #3 to a 1st
intermediate frequency of 322.5 MHz. The LO is doubled at tuned
frequencies above 17 GHz. The 322.5 MHz I.F. output is at A13J7 of the RF
Front End Assembly. This is the signal path for N8975B, 26.5 GHz
Frequency Range (for frequencies
≥
13.6 GHz). The control voltages and
biasing for these assemblies come from the A15 Front End Control
Assembly.
Содержание N8973B
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Страница 44: ...44 Keysight NFA Series Noise Figure Analyzers Service Guide Overview How to Return Your Instrument for Service ...
Страница 132: ...132 Keysight NFA Series Noise Figure Analyzers Service Guide Instrument Messages Condition Messages ...
Страница 228: ...228 Keysight NFA Series Noise Figure Analyzers Service Guide RF Section Troubleshooting N8976B Troubleshooting ...
Страница 268: ...268 Keysight NFA Series Noise Figure Analyzers Service Guide Analog Digital IF Troubleshooting 25 MHz BW IF Section ...
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Страница 332: ...332 Keysight NFA Series Noise Figure Analyzers Service Guide Block Diagrams Block Diagrams NFA Computer Block Diagram ...
Страница 350: ...350 Keysight NFA Series Noise Figure Analyzers Service Guide Service and Diagnostics Menus Front Panel Key Test ...
Страница 470: ...470 Keysight NFA Series Noise Figure Analyzers Service Guide Assembly Replacement Procedures Front Frame Assembly ...