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
Содержание N8973B
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