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Page Title:
Section VI. OSCILLATOR AND MODULATOR PRINTED CIRCUIT |
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  TM 11-6130-385-34
input
filter
to
capacitors
C601
through
C610.
The
exceed
the
capacity
of
the
+
28-vdc
source.
The
capacitor
bank
provides
an
additional
source
of
capacitor
bank
also
aids
the
input
filter
in
current
to
supply
the
output
drive
circuit
when
eliminating
voltage
spikes
and
rf
noise
generated
by
instantaneous
demands
by
the
power
switch
circuits
the
power
switches.
Section
VI.
OSCILLATOR
AND
MODULATOR
PRINTED
CIRCUIT
BOARDS
to
another
divide-by
6
counter
(U104,
U105)
14),
and
which
produces
three
400-Hz
square
wave
outputs.
The
three
400-Hz
square
waves
are
directed
a. The
oscillator
uses
a
piezoelectric
crystal
unit
to
three
tuned
transformers
(fig.
which
(Y101)
to
generate
a
high
precision
oscillation
of
develop
a
3-phase,
400-Hz
sine
wave
signal
for
use
2.4576
MHz
when
a
+5-volt
input
is
applied.
The
on
the
modulator
boards.
The
three
400-Hz
sine
oscillator
(Y101,
U101)
provides
the
2.4576
MHz
wave
signals
are
also
routed
to
the
recovery
drive
square
wave
to
countdown
unit
U102
which
directs
a
circuit
These
signals
are
processed
in
the
38.4-kHz
signal
to
Q101B.
This
is
conducted
to
a
recovery
drive
circuit
by
comparator
amplifiers
divde-by-6
circuit
(U103,
U104)
to
produce
three
6.4-
kHz
high
frequency
square
wave
pulses
for
the
three
(U106,
U107)
and
drivers
(U108)
through
push-pull
transistors,
the
output
of
which
is
a
400-Hz
square
phases
to
use
on
the
modulator
boards
(fig.
wave
of
14
volts
peak
to
peak.
b.
The
oscillator
countdown
module
(U102)
supplies
a
2
.4-kHz
signal
to
Q102B,
which
is
routed
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