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Figure 1-7. Transmitter of demolition firing device M122 (ready for use).
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TM-9-1375-213-12-3 Firing Decive Demolition.M122 (NSN 1375-01-021-0606) (EIC: 2NA) Manual
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Figure 1-8. Battery pack.
TM 9-1375-213-12-3
TO 11A20-15-1
unit) causes transmission of the selected signal.
b. Transmitter.
Power is provided by the special battery pack
when installed in the unit.
(1) The transmitter (fig. 1-2 and 1-7) is
a one piece, self-contained unit similar in appear-
c. Receiver. The receiver (fig. 1-3) is a
ance to a walkie-talkie. The fully transistorized
small box with an integral, cylindrical battery
unit which is powered by a battery pack can gen-
compartment on top. It contains the electrical
erate, encode, and transmit a radio signal to acti-
circuitry to fire the attached blasting caps upon
vate a receiver. Over a million different codes
receiving the properly encoded command signal
may be selected for transmission;  therefore,
from a transmitter. Special circuitry allows the
many receivers may be activated from one trans-
receiver to be actuated only by receipt of a
mitter in a short period of time.
coded radio signal unique to the particular
receiver. Each and every receiver has its own
(2) The following operational parts are
individual code. Power for the operation of the
accessible from the top of the transmitter (fig.
receiver and for the firing of the blasting caps is
1-2).
a single D cell. The receiver (figs. 1-3 and 1-4)
incorporates the following features:
(a) One four-position rotary area
code switch used to select the letter of the code
to be transmitted.
(1) An identification plate located on
the side of the receiver.
(b) Six push-button switches with
visible numbers (0 to 7) to select the digits of
(2) The code settings required for the
receiver are stamped into the body adjacent to
the code to be transmitted or setting of the unit
the identification plate.
into a self-test mode.
(3) A carrying ring.
(c) A fire signal lamp which indi-
cates proper operation when the unit is being
self-tested or used.
(4) A battery compartment with its
screw-on cap. The screw-on cap incorporates a
nylon retaining cord.
(d) A 47-inch telescopic antenna
which can be totally collapsed within the trans-
(5) A delay-arming switch.
mitter carrying handle and then secured by a
screw-on cap,
(6) Antenna binding post.
(e) A fire button with a spring-
Two blasting cap binding posts.
loaded protective cover.
(7)
(8) A fire signal lamp.
NOTE
(9) An index mark (provided as visual
reference to assure proper tightening of battery
cap).
An identification plate bearing the
item name, part number, and serial
d. Batteries.
number is located on the side of the
unit.
(1) The transmitter requires a special
alkaline battery pack (fig. 1-8). A fresh battery
pack should have the capacity to provide at
least 1000 transmissions. Shelf life is about 18
(f) A special antenna connector
months. Because it is a low usage item, it will
(female, MIL-C-39012/62-3002, radio frequency
series SMA) is provided for factory use.It may
not be stocked locally. It is advised that a fresh
battery pack be requisitioned once a year
be utilized by some users under special circum-
whether the transmitter has had heavy usage
stances.
or not.  If the transmitter will receive heavy
usage, order a replacement battery far enough
(3) Pushing the fire button (located
in advance to allow for delivery from a central
beneath a spring-loaded cover on the top of the
supply organization in time for use.
1-8

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