HP 8340b User Manual

A45
Directional
Coupler
Theory
of
Operation
The
A45
directional
coupler
divides
the RF
output
of the
A44
YO
into
two
paths.
The
output
of the
coupled
arm
goes
to
A45J1.
This
signal
is
attenuated
by
AT2
and
goes
through
the
A46
7.0
GHz low
pass
filter
to the
A48
YO
loop
sampler.
The
sampler
mixes
the
coupled-off
YO
signal
with
the
Nth
harmonic
of the
M/N
output
signal.
The
result
is
the
Sampler
IF
signal,
which
goes
to
the
A49
YO
loop
phase detector.
The
RF
signal
from
the
coupler's
main path
is
the
YO
output
signal
at
A45J3.
This
signal
is
sent
to
the
A16
modulator/splitter (located
in
the RF
section).
AF2J2
AH5J3
RF
OUTPUT
(TO
A16J2
VIA
W51
AND
W3)
AT2
15dB
ATTENUATOR
(TO
A46
VIA
WHS)
AT2J1
A4.5J2
A45J1
(TO
AW
YO
J2
VIA
Wt2)
Figure
D-2.
A45
Directional
Coupler
Assembly
Drawing
A46
7
GHz
Low
Pass
Filter
Theory
of
Operation
The
A46
7
GHz
low
pass
filter
is
connected
by
coaxial
cables
between
the
AT2
15
dB
Attenuator
and
the
A48
YO
loop
sampler.
It
filters
out
the
harmonics
of
the
coupled-back
portion
of
the
YO
output
from
the
directional
coupler
to
prevent
unwanted
mixing products
in
the
sampler.
Sweep
Generator
-
YO
Loop
Theory
of
Operation Change
10
HP
8340B/41B

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English