The frequency
of the
incoming signal
should be
within
0
0.5
to
+5.0
MHz
of
the
selected
frequency or
the analyzer
will not
be able
to phase
lock
to
it.
CW Frequency
Range in
External Source
Mode
.
300
kHz
to
3
GHz
(6
GHz
for
Option
006)
Compatible Sweep
Types.
The external
source
mode
will
only
function
in
CW
time
sweep
.
If the
instrument is
in any
other
sweep
type
when
external
source
is
activated,
the
warning
message
CHANGED
TO CW
TIME
MODE
will
appear
on
the
display
.
External
Source
Requirements
.
The
external
source
mode
has
spectral
purity
and
power
input
requirements
,
which
are
described
in
Chapter
7,
\Specications
and
Measurement
Uncertainties
."
Input Channel:
R
Capture Range
.
In
either
automatic
or
manual
mode
,
you
can
enter
the
frequency
of
the
external
CW signal
using the
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
CW
FREQ
softkey
(located under
the
Stimulus
4
MENU
5
key). The
actual
signal
must
be
within
a certain
frequency capture
range as
shown in
T
able
6-7
.
T
able
6-7.
External
Source
Capture
Ranges
Mode CW
Frequency
Capture
Range
A
utomatic
50
MHz
6
5
MHz
of
nominal
CW
frequency
>
50
MHz
6
10%
of
nominal
CW
frequency
Manual
All
0
0.5
to
+5
MHz
of
nominal
CW
frequency
If
the
incoming
signal
is
not
within
the
capture
range
,
the
analyzer will
not
phase
lock
correctly
.
Locking
onto
a
signal
with
a
frequency modulation
component.
Although
the
analyzer
may
phase-lock
onto
a
signal
that
has
FM, it
may
not
accurately
show
the
signal's
amplitude
.
The
accuracy
of
such
measurements
depends
greatly
on the
IF bandwidth
you
choose
.
Use
the
widest
IF
bandwidth
available
(3
kHz)
if this
problem occurs
.
Tuned
Receiver
Mode
If
you
press
4
SYSTEM
5
N
N
N
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
INSTRUMENT
MODE
N
N
N
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
NN
NN
N
N
N
N
N
N
N
TUNED
RECEIVER
the analyzer
receiver operates
independently
of
any
signal
source
.
The
following features
and limitations
apply
to
the
tuned
receiver
mode:
It is a fully synthesized receiver; it does not phase-lock
to any source
.
It functions in all sweep types
.
It requires a synthesized CW source whose timebase is input to the analyzer's
external
frequency reference
.
For more information on using the tuned receiver mode
, refer to Chapter 2, \Making
Measurements."
Application and Operation Concepts 6-111
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