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Wavetek 3000 - Modulation Features; C316 - Modulation Board; Modulating Signals

Wavetek 3000
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3.3.2
Modulation
Themodulating
signal
fromassembly
C316
is
applied
to
the
VERNIER
whichultimately
causes the
RF
level
to
change
.
The
leveler
in
the
M10W
does
not
cause
the
RF
level
to
respondlinearly
to
changes
in
the
level
programvoltage
.
To
com-
pensate
for
this,
a
stage
is
included
to
shape
the
modulation
signal
before
it
is
applied
to
the
VERNIER
.
3.3.3
Meter
The
outputlevelmeter
(front
panel)
is
controlled
by
the
level
programfrom
the
VERNIER
.
The
meter
and
its
driver
cir-
cuit
are
designed
to
display
a
reading
which
corresponds
to
the
actual
RF
level
from
the
M1OW
.
3
.3.4
"Unleveled"
Light
A
light
emitting
diode
is
mountedon
this
assembly
and
appears
on
the
front
panel
of
the
instrument
.
Refer
to
the
MOGUL
AT/ON
/NPUT
M10W
description
for
an
explanation
of
the
circuitdriving
this
light
.
3
.4
C316
-
MODULATION
BOARD
This
assembly
provides
the
modulating
signals
used
in
the
AM
and
FM modes
.
The
front
panelACCURACY
lights
and as-
sociatedcircuitry
are
also
on this
as-
sembly
.
See
Figure
3-9
.
3
.4 .1
Modulating
Signals
The
AM
or
FM modes
are
achieved
by
simply
routing
essentially
the
same
signal
to
the
appropriate
circuitry
by
means
of
the
front
panelMODE
switch
.
The
front
panel
MODULATION
FREQ
switch
selects
one
of
four
sources
of
modulating
frequency,
one
external
and
three
inter-
nal
.
The
internal
signal
can
be
selected
from
one
of
two
CW
oscillators
or
a
man-
uallyvariableDC
control
.
FROM
PHASE
L
OCKEO
L
OOiL5
Figure
3-9
.
C316
Modulation
Board
THFORY
OF
OPFRATION

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