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Page Title:
Figure 1-1. Transmitter and receiver of demolition firing device M122. |
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 TM 9-1375-213-12-3
TO 11A20-15-1
RECEIVER
TRANSMITTER
Figure 1-1. Transmitter and receiver of demolition firing device M122.
b. The maximum operating distance from
Receiver ---------------------- M122 Receiver
Part No. 9279048
the transmitter to receiver will vary with the ter-
Serial No.
rain, The nominal operating distance is a mini-
mum of 1000 meters (0.6 of a mile). Under
adverse terrain conditions such as dense forest
DESCRIPTION
1-8.
or frozen tundra, an operating range of less
than 0,6 mile (1000 meters) may be experi-
a. General. The major components of the
enced. In clear areas and with good weather
tranamitter receiver are shown in figures 1-
where a line of sight exists between the trans-
1 through 1-7. The transmitter is used for
mitter and receiver, operations are possible at
encoding and transmitting a radio signal and
distances up to 3.2 kilometers (2 miles) over
has its own antenna collapsed within the carry-
land, 5 kilometers (3 miles) over water, and 10
ing handle. The receiver with an attached
kilometers (6 miles) from aircraft to an open
antenna wire is used for receiving and decoding
(uncovered) firing site.
the incoming radio signal. This signal triggers
electronic firing of attached blasting caps that
1-7.
IDENTIFICATION
initiate explosive charges, The firing device is
issued in sets consisting of one transmitter and
10 receivers in a fittedcarrying case (fig. 1-5
The transmitter and receiver are colored
and 1-6). The initial batteries and special bat-
olive drab with white marking. Metal identifi-
tery pack will not be supp lied with the item.
cation plates on the transmitter and receiver
Batteries and battery packs must be requisi-
bear the following information:
Receiver
tioned through normal channels.
batteries should be available for over-the-
Transmitter ------------------ M122 Transmitter
counter issue in most areas. Batteries or bat-
Part No. 9252773
Serial No.
tery packs are not shipped installed in the
devices and must be installed before checkout
test or use.
1-3
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