Keysight N8973B User Manual

Keysight NFA Series Noise Figure Analyzers Service Guide 141
RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
RF Section Description
Front End Control Assembly
Provides the correct biasing and switch control logic to the following RF
assemblies:
— Input Attenuator A
— Input Attenuator B
—Low Band Switch
— YTF Preselector (Input signals > 3.6 GHz)
— RF Front End Assembly
— High Band Preamplifier
— Low Band Preamplifier
Table 4-2 A13 RF Front End Signals
Signal Name Description From To
RF Input 9 kHz to 3.59 GHz RF Input A11J2, Low Band Switch A13J2
Microwave Input 3.6 GHz to 26.5 GHz
U-wave RF Input
YTF Output A13J9
E-cal Input Cal Signal Port A16J705, Ref. Bd A13J6
1st L.O. Input 3.8225 to 8.7225 GHz 1st L.O. A14J40, Synth. Bd A13J4
2nd L.O. Input 4.8 GHz 2nd L.O. A16J702, Ref Bd A13J1
I.F. Output 322.5 MHz I.F. Signal A13J7 A2J100, AIF or
A15J902, EFEC
To Band Pass Filter Filter Port, 1st I.F.
Amplifier Output
A13J10 5.1225 GHz Cavity
Input
From Band Pass Filter Filter Port, 2nd Mixer Input 5.1225 GHz Cavity Output A13J11
Refer to Chapter 6, “Front End Control Troubleshooting.” for detailed
descriptions & troubleshooting procedures

Keysight N8973B Specifications

General

Brand	Keysight
Model	N8973B
Category	Measuring Instruments
Language	English