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7. VIBRATOR POWER SUPPLY UNIT
MI-22215
(6-Volt Storage-Battery Operation)
(Note: This item supplied only when specifically ordered)
7.1 General
7.1-1 The MI.22215 identifies the equipment fur-
nished with the power supply unit and
consists of the following items:
1—Vibrator Power Supply, complete with
vibrator and Type-OZ4A rectifier valve.
1--Power • Cable, approximately 8 feet
long, equipped with power switch, fuse
holder and fuse, terminals for connect-
ing to the vibrator power supply unit,
and terminating in a plug for connect-
ing to the associated receiver.
7.1-2 Electrical Characteristics:—
Output .
300 volts, 90 ma.
Battery Voltage ... ... 6 to 8 volts
Total current drain (operating
AR-88-LF.) receiver
12 amperes
Fuse Rating
20 amperes
7.1-3 Valve Complement
1 Type OZ4A
7.1-4 Mechanical Specifications:—
Dimensions:—
Height .
.
... 61/2 inches
Width
5 inches
Depth
51/ a inches
Weight (net) .. .
. 7 pounds
7.2 Technical Details:
The MI.22215 vibrator
power supply unit is primarily designed for the
purpose of adapting the General Purpose Com-
munication Receiver (Model AR-88LF) to 6-volt
battery operation. Four rubber feet are provided
for resting the unit on a table or shelf. If pre-
ferred, these feet may be removed to expose
threaded studs by which the unit may be bolted
permanently in position.
NOTE--The power supply unit must be mount-
ed with the vibrator in an approximately ver-
tical position.
Direct current at high potential is obtained by
means of a non-synchronous vibrator used in
conjunction with a step-up transformer. Rectifi-
cation is obtained by the use of a Type OZ4A
rectifier valve. This power unit has been de-
signed and tested to operate under a wide variety
of climatic conditions.
7.3 Installation
7.3-1 Connecting the power cable to the vibrator
power supply unit. In order to connect the
power cable to the vibrator power supply
unit, first remove the terminal board cover
from the power unit by removing the two
self-tapping screws in the cover. About
four feet from the end of the cable to
which the two large battery clips are at-
tached, a group of four wires, each about
four inches long and equipped with a
spade terminal, extends from the cable.
These leads should be connected to the
power unit terminal board — the brown
lead to the terminal marked "A—HOT",
the yellow lead to "B—" and the red lead
to "B+." Replace the terminal board cover
with the three leads extending from the
open end of the cover, connecting the
black lead under one of the screws which
hold the cover.
7.3-2 Mounting the Switch. Fasten the switch to
bracket on the top of the transformer can,
or to any place convenient to the Power
Supply.
7.3-3 Connecting the Power Cable to the Re-
ceiver. Remove the plug from the socket
on the rear apron of the receiver. Insert
the plug, on the end of the vibrator power
supply cable, into this socket.
7.3-4 Adjustments. A four-position rotary switch
on the rear of the chassis is used to adjust
the vibrator output voltage to compensate
for variations in the battery voltage. The
positions on this switch are numbered from
"1" to "4" inclusive. The position in which
the switch rotor is placed is indicated by
the direction in which the screw-driver
slot in the rotor shaft is pointing. For pro-
per selection of the switch position, consult
the following table:
Switch Position
'A' Battery Voltage
4
6.0 to 6.5 Volts
3
6.5 to 7.0 Volts
2
7.0 to 7.5 Volts
1
7.5 to 8.5 Volts
7.3-5 Connecting the Power Cable to the
Storage Battery. Turn the power switch in
the power cable to the "OFF" position.
These are two battery clips connected to
one end of the power cable, each clip serv-
ing to terminate a pair of wires. On one
clip, both wires are black while on the
other clip one wire is green and the second
is brown. Connect the clip with the two
black wires securely to the negative (—)
terminal of the storage battery. Be sure to
make good contact at this point. Connect
the clip with the green and brown wires
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