Operating instructions
switch
S103. contacts 23
and 24
of relay K101,
sectiorl
2
of
S101, resistor
R104,
and L101.
R104
clrops
the l2-volt
input
voltage
to the
6
volts required
to energize E101.
The
combina-
tion of L101
and
C104 makes
up
a
hash
filter.
D.
The l2-volt
d-c
potential
to be interrupted
by
the vibrator
is fed
from POWER
INPUT
receptacle
J103,
contact B,
to
pins
1
and
5
of
vibrator E101.
The
voltage is
fed
through
sec-
tion 1
of POWER
SELECTOR
switch
5101,
fuse F103,
section 2
of POWER
ON-OFF
switch
5103,
contacts 26
and
25
paralleled
by 27
and
28
of relay K101,
to section
3 of POWER
SE-
LECTOR
switch
5101. From
this
point,
the
voltage
is supplied
to contact
5 of E101
through
winding
6-9
of T102,
section
1
of
5101,
and
L104,
ancl
to contact
1
of
ElOl
through
winding
5-2
of T102,
section
2
of 5101,
and L105.
C112
is a buffer
capacitor;
capacitors
C107 and
C108,
in conjunction
with L104
and L105,
are hash
filters.
The interrupted
voltage is
used
as
the
primary
voltage for
T102.
High
voltage is
de-
veloped in
the
secondary
of T102 in
the
same
manner
as
described
in
paragraph
45.
c.
Voltage for
the driving
coil
of
vibrator
E102 is
taken from
the
junction
of
contact 24
of
K101
and
contact 12
on section 2
of
5101,
and supplied
through section
1 of
S101, resistor
R102,
contacts 22
and 21
of K101,
and L108.
Resistor
R102
drops
the
input
voltage to 6
volts.
Operation
of E102
is described
in
paragraph
45s.
d.
In the 12-volt
operation,
the heaters
of
V101
and V104
are connected
in
series. The
required
12-volt
potential
is taken
from
the
junction
of
paralleled
contacts
27-28
ancl26-25
on K101
(o
above)
and is
connected
across
the
heater
through
contacts
7
ancl 8
of
K101,
con-
tacts 11
and 10
of relal'
K101,
section
3
of
-s101,
and contacts
19
and
18
of relay
K101.
rr.
The 12-volt
d-c
potential
available
at con-
,
t 24
of
K101
also is
connectecl
through
sec-
n
4,
rear,
of 5101
to
pin
7 of
J101.
This
tential is
used for receiver
disabling.
3+
49.
24-volt D-c
Operotion
(fig.21)
In 24-volt
operation.
the circnit
of
the
power
supply
is
the same
as for' 12-r'olt
operation,
ex-
cept for
the
addition
of r-olta.ee-clropping
re-
sistors,
a change
in the rvinding
used
as
pri-
mary
of
T102,
and
the
use of
fuse
F102
(24V.
3.{.).
o. In
this mode
of operation,
resistors
R102
and R103
are in
series,
and R104
and R105
are
in
series,
to limit
the current
to
the driving
coils
of
the vibrators.
Operation
of the
vibra-
tors is
the same
as for 12-volt
operation.
Wind-
ings
1-5
and 6-10
are
used
as the
primary
of
transformer
T102.
Resistor
R107 is
used
to
limit
the current
through
the
primary
r,vindings,
thus
reducing
the
primary
interrupted
voltage
to
give
a secondary
voltage
of the same
magni-
tude
as the
other modes
of operation.
b. The
filaments
of V101
and V104
are
con-
nected
in series,
with
resistor R106
to
limit
the
current
and
to reduce
the
24
volts input
to
12
volts
across the heaters.
c. The 24-volt
d-c
potential
is
taken
from con-
tact 24
of
K101
ancl connectecl
thronsh
section
4, rear,
of 5101
to
pin
1 of
J101 as a leceiver
disabling
voltage sorlrce.
50.
Dry-bottery
Operotion
(fig.
22)
In
dry-battery
operation,
the
power
supply
is used
merely
as
a connecting
device.
a.
B+
voltage
(90
volts dc) is fecl
from DRY
BATTERY receptacle
J104, contact A,
to
pin
6
of
J101 through
section
1
of POWER
ON-
OFF srvitch
5103, section 4 of POWER
SELEC-
TOR srvitch
S101,
and contacts 1 and 2
of re-
la1'
11191.
b.
Filament
voltage
(1.4
volts
dc)
is fed
from
J104, contact
B,
to J102 and
pin
11
of
J101, through
section 2
of 5103, section
5
of
5101, and contacts
4 and 5
of
relay K101.
c. Bias
for
tubes
V7 ancl V8 in
the receiver
is
supplied from
J104, contact
D,
to
pin
8 of
J101.
Pin
8 of
J101 is
-4.2
volts clc from
ground
be-
canse
of the
ground
retllrn through
resistors
R109
and R108.
AGO
313A