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Step
Control/Connector
3
SWEEP MODE
4
SWEEP
WIDTH
Setting
SWEEP STOP.
Desired
stop
sweep
quency.
CONT
SWE EP.
5
SWEEP MODE
6
SWE
EP
TIM
E
As desired.
NOTE
To
manitor
the ramp
generator,
Ltse
the
SWE EP
OUT connector. To
monitor
the frequency
of
the main generator,
use
the GCV OUT
cannector,
which
is
a
voltage
prCIportional
to
the
generator
freguency.
Crystal
control
and
sweep
contral
may
be used
simultaneousfy,
but it
/s
not
recornmended.
llowever,
s'iscrete
frequency
stepping does
occur
for
XCG
freguencies
within
the
sweep
range,
,srovided the sweep
time
be{ween
each freq
uency
is
rnuch longer
than
the
loek time
af
the XCG
circu
it.
3"2"7
XCG
lVlode
":iCG
(crvstai contrclled generatcri operaticn ailows
selected
XCG
freguencies
to
Lre
iockeci
to
a crvstal osciilator
tor
Jreater
accLrracv.
,(CG
i'requencies
correspcnci
to
each of
:he 25 rjial
rnarks,n
the;{
'!il thru
X
'l
M
ranges.
Fcllcw
the
steps
in
paragraph 3.2.2" except
in
step
3
set
GfN
lllCDE
to
)(CG.
in
step
7,
irequencrT
selection"
the
XCG iamp
will
light when frequencv
iocring
occurs.
3.2"8
Voltage
Control
-
VCG
Cperation
with
voitage
control
can
be
done in any
rnode
but
is
usually
done
in
continuous mode;
the
frequency
within
a
particular
range
is
additionally controlled
with
dc
levels
within
t5V,
injected
at the VCG
lN
connector.
Per-
form the
steps
given
in
paragraph
3.2.2,
only
set
the
fre-
quency dial to determine
a
reference
from which
the
frequen-
cy
is
to
be voltage
controlled.
For
frequency
control
with
positive
dc
inputs
at
VCG
lN,
set
the dial
for
a
lower
limit
from
which
frequency
is
to
be increased.
For
frequency
control
with
negative
dc
inputs
at
VCG
lN,
set
the
dial
for
an upper
limit
from
which
frequency
is
to
be decreased.
3.
For modulation
with
an ac
input
at
VCG
lN,
set the
dial
at
the
desired
center frequency. Do not
exceed
the
maximu m
dynamic
range
of
the selected
f
requency
range.
NOTE
Crystal
control
and
voltage
control
may be
used
simultaneously; however,
ac
excursions
in
this
mode are
not
recommended.
Figure
3-8
is
a
nomograph
with
examples
of
the frequency
dial
effect
as
a
reference
for
VCG
lN
voltages. Example
1
shows
that
with 0V
VCG
input
(2nc1
column),
frequency
{3rd column)
is
as
determined by the frequency
dial
setting
of 2
{1st column).
Example
2
shows
that with
a
positive
VCG
input,
output
frequency
is increased.
Example 3
shows
that with
a
negative
VCG
input, output
frequency is
de*
creased.
{Note
that
ihe
Factor
of
50SZ
OUT
Frequency
:olumn
must be
muitiplied by
the frequency
range
in crder
lo
give
the
actual
5052
OUT frequency.)
For
full
1000:1
VCG
sweep
of
the
generator
f
requencies,
set
the
F R
EO
'/ERNIER
full
ccw.
FACTOR
OF
50r}
our
FH
EGU
ENCY
--T-.0o5
I
\
NOTE
The
F R
EO
VE
R
N
lE
R
must
be
rotated
fu
ll
ccw
for
1000:1
range.
Figure
3-8.
VCG Voltage-to-Frequency Nomograph
f
re-
rR
EOUENCY
DiAL
SETTING
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