134 Keysight NFA Series Noise Figure Analyzers Service Guide
RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
RF Section Description
RF Section Description
Purpose
This section covers only those model numbers listed below for the NFA Series
Noise Figure Analyzers.
— N8973B (10 MHz - 3.6 GHz)
— N8974B (10 MHz - 7 GHz)
— N8975B (10 MHz - 26.5 GHz)
— N8976B (10 MHz - 40 GHz)
The RF input signal can be routed through three different front end signal
paths. These various paths are switched in and out based on where the signal
analyzer center frequency is tuned.
1. Low band RF path is used when the input frequency is ≤ 3600 MHz
2. High band RF path #1 is used when the input frequency is > 3.6 GHz to
13.6 GHz
3. High band RF path #2 is used when the input frequency is > 13.6 GHz to
26.5 GHz
The RF section is designed to convert RF input signals to an intermediate
frequency (IF) that is present at the RF output of the A13 Front End assembly.
This IF depends on installed options and the IF path selected. This chapter will
assume the analyzer is in Spectrum Analyzer mode. Therefore, the IF will be
322.5 MHz.
IF Path IF Mode
10 MHz (standard) 322.5 MHz Spectrum Analyzer or
IQ Analyzer
25 MHz (Option B25) 322.5 MHz IQ Analyzer
To Next Page
Loading...
Need help?
General
