Keysight N8973B User Manual

Keysight NFA Series Noise Figure Analyzers Service Guide 281
L.O. Synthesizer/Reference Troubleshooting
A16 Reference Assembly Description
Table 8-2 A16 Reference Assembly Signals
Signal Description From Location Originates From To Location Purpose
External Reference Input
(1 to 50 MHz,
-5 dBm to +10 dBm)
Input from User n/a A16704 Phase Lock analyzer with
user reference.
10 MHz Out DIF A16J710 10 MHz Reference A3J14 Used as a reference to other
assemblies throughout the
instrument.
50 MHz Align Signal A16J701 100 MHz VCXO/2 A9, Cal Signal
Input, Input
Attenuator A.
50 MHz Low band alignment
signal.
4800 MHz Align Signal A16J701 2.4 GHz VCXO x 2 A9, Cal Signal
Input, Input
Attenuator A.
4.8 GHz High band
alignment signal
50 MHz Ecal/300 MHz
Comb Output
A16J705 100 MHz
VCXO/2, 100 MHz
VCXO x 3
A13J6, RF
Front End
Assembly
50 MHz Cal Signal or 300
MHz Comb for wideband I.F.
phase linearity
100 MHz
Ref A
A16J707 100 MHz
VCXO
A19J901 Reserved for future use.
100 MHz
Ref C
A16J717 100 MHz
VCXO
Not used Reserved for future use.
300 MHz LO AIF A16J711 100 MHz
VCXO x 3
A2J300 Used as 3rd LO on A2
Analog IF (AIF) assembly
2.4 GHz Ref A16J718 2.4 GHz VCXO A25J301 Reserved for future use.
4.8 GHz 2nd LO A16J702 2.4 GHz VCXO x 2 A13J1 2nd LO for A13 Front End
assembly, downconvert low
band 1st IF to 322.5 MHz
2nd IF
4.8 GHz 1st LO Ref A16J703 2.4 GHz VCXO x 2 A14J4 4GHz reference for Offset
Loop, only used in
Dual-Loop operation

Keysight N8973B Specifications

General

Brand	Keysight
Model	N8973B
Category	Measuring Instruments
Language	English