Agilent Technologies 83640B Service Guide

20.
FM Bandwidth
(F
or
B-Series
Only)
Description
and
Procedure
Use
this
pro
cedure
to
v
erify
that
the
RF
output
p
o
w
er do
es not
vary
more than
a
sp
ecied
amoun
t
o
v
er
the sp
ecied frequency
mo dulation
rate frequency
range.
A
lo
w
frequency
spectrum
analyzer with
a
trac
king
generator
op
erates
as
a
net
w
ork
analyzer
to
measure
the
FM
atness.
Flatness
errors
asso
ciated
with
the
trac
king
generator
and
spectrum
analyzer are
calibrated
out
of
the measuremen
t. Flatness
errors due
to the
p
o
w
er
splitter
and
micro
w
a
v
e
amplier are
minimized
b
y
external
lev
eling
at
the
amplier.
The
dela
y
line
discriminator
is
used
to
demo
dulate
the
FM
from
the
RF
carrier.
It
also
provides
an input
to the
sp
ectrum
analyzer
that
is
equivalen
tto
the trac
king
generator
frequency
and
prop
ortional
in
p
o
w
er
to
the
syn
thesizer
RF
output.
The
dela
y
line
discriminator
is
formed
b
y
driving
a
mixer
with
a
mo
dulated
carrier
in
to
the
LO
p
ort,
and
a
dela
y
ed
carrier
in
to
the
RF
p
ort.
The dela
y
is
pro
duced
with
a
cable
of
appro
ximately
3
feet
in
length.
With
this
setup, the
mixer
resp
onds
to
phase
dierences
bet
ween
the t
w
o
inputs.
The
cable
has
a
constan
t
time
dela
y
and,
as
the
carrier
frequency
is
frequency-mo
dulated, a
linear phase
shift o
ccurs
b
et
w
een
the
mixer
inputs.
Since
the
mixer
inputs
are
in
quadrature,
the
mixer
op
erates
as a
phase detector
that
amplitude
trac
ks
the
RF
input
(syn
thesizer
p
o
w
er)
and
has
an
output
frequency
corresp
onding
to the
FM rate
(trac
king generator
frequency).
Agilent 8360 Performance Tests
FM Bandwidth
2-95

Agilent Technologies 83640B Specifications

General

Brand	Agilent Technologies
Model	83640B
Category	Portable Generator
Language	English