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exceed
the
limits
of
the
selected
frequency
range
Figure
3-4
is
a
nomograph
with
examples
of
dial
and
voltage
effects.
Example
1
shows
that
with
OV
VCG
in-
put.
frequency
is
determined by
the
main
dial
setting.
2
(linear
mode)
or
04
(logarithmic
mode)
In
this
exam-
ple.
Example
2
shows
that
with a
positive
VCG
input,
output frequency
is
increased
Example
3
snows
that
with
a
negative
VCG
input,
output
frequency
is
decreased
(Note
that the
Output
Frequency
Factor
column
value
must be
multiplied
by
a
frequency range
multiplier
to
give
the
actual output
frequency
MAIN
DIAL
VCO
IN
OUTPUT
SETTING
VOLTAGE
FREOUENCV
FACTOR
Figure
3-4.
VCG
Voltage-to-Frequency
Nomograph
The
up
to
1000:1
(linear)
or
10.000:1 (logarithmic)
VCG
sweep
of the
generator frequencies
available
in
each
range
results
from
a
4V
excursion
at the
VCG
IN
con-
nector
With the frequency
dial
set to
4.0.
excursions
between
- 4V
and
0V
at
VCG
IN provide
the
up
to
1000.1
(lm)
or 10.000:1
(log)
frequency sweep. With
the
d>ai
set to
.004
(linear)
or
0004
(logarithmic), ex-
curs ons
between
0V
and
+
4V
at
the
VCG
IN provide
up
to
1000:1
(linear)
or 10.000:1
(logarithmic
sweep
within
me
set
frequency range
3.2.4
Sweep
Generator Operation
Operation as
a sweep
generator
is
similar
to
manually
controlled
generator
operation
except
the
main
generator
can be
repetitively
swept
between
two
selected frequencies
either linearly or logarithmicly
at
a selected
sweep
rate
The
relationship of internal
ramp and
mam
generator
is
shown
in
figure 3*5.
The
io*Ow»ng steps describe
the
sweep
operation
setup
GCV
OUT
soo
OUT
8TOP
FREO
LEVEL
START
FREO
LEVEL
STOP FREQ
CONTROL
NOTE
Nonlinear operation
may
result
when
the
VCG
input
voltage
is
excessive,
that
is.
when
the
attempted generator frequency
exceeds
the
range
limits.
The upper
limit
is
four
times
the
multiplier
setting,
and
the
lower
limit
is
1/IOOOth
(linear)
or
UtO.OOO
(logarithmic)
of the
upper
limit
Figure
3-5.
Effect of
Sweep
Time and Width
on Output Frequency
Step
Control
Setting
1
MOOE:
CONT
8
Press
to
release
(Continuous
mode
of
main
generator
is
necessary
for
sweep
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