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 TM 9-1375-213-12-3
TO 11A20-15-1
NOTE
WARNING
It takes the delay arming timer a mini-
DO NOT CONNECT BLASTING
mum of four minutes to arm the
CAP CIRCUIT TO A RECEIVER
receiver (i.e., to put it into a state
WHICH DOES NOT HAVE
wherein receipt of the properly encoded
CONTINUITY BE'TWEEN THE
signal will actuate it and fire the con-
BLASTING CAP BINDING POSTS.
nected blasting caps). The exact arm-
IT COULD ACTIVATE THE CAPS
ing time will vary with conditions, etc.,
WHEN THE CONNECTION IS
so always allow 8 minutes before
MADE.
attempting to fire the device.
NOTE
2-4. FIRING PROCEDURES
Assure that the wire insulation is not in
the binding posts. Such an improper
connection will cause a misfire.
WARNING
M122 IS CAPABLE OF INITIA-
p. Clear the area of unnecessary personnel.
T I N G E X P L O S I V E TRAINS
Keep blasting caps away from the explosive
REGARDLESS OF POSITION OF
charges.
ANTENNA. DO NOT DEPRESS
FIRING BUTI'ON UNTIL READY
TO FIRE.
WARNING
KEEP BLASTING CAPS AWAY
NOTE
FROM EXPLOSIVE CHARGES
AND FACE AWAY FROM THE
Before firing, allow 8 minutes to ass
BLASTING CAP WHEN PERFORM-
after the arming switch is set to ARM.
ING OPERATIONAL CHECK OF
THE RECEIVER.
a. Unless the battle is exhausted or the
receiver's arming switch is manually set to
Untwist shorted firing lead conductors
SAFE, the receiver will fire its connected blast-
or lasting cap circuit conductors and secure
in caps whenever it receives the programmed,
one conductor in each of the receiver's blasting
coded signal, If the receiver is to be left on
cap binding posts.
duty for an extended period, refer to paragraph
1-11 and table 3-1 for expected receiver on duty
r. Hold receiver still with one hand, lift the
times under various operating conditions.
arming switch lever, and move it to the ARM
Refer to paragraph 3-11 and table 3-1 on how
position. After 15 seconds lift and move the
to test for battery freshness.
arming switch back to the SAFE position.
(1) When it is desired to fire the receiv-
s. Secure caps to explosives in accordance
er's caps:
with standard procedures.
(a) Set the receiver's code in the
t. When it is desired to start the receiver's
transmitter. Set letter using area code switch.
arming cycle, hold the receiver still with one
Set numbers using the six push button
hand, lift the arming switch lever, and move it
switches,
to the ARM position. Note the time of day.
u. Clear the area of all friendly personnel
and proceed to the transmitting location.
CAUTION
Whenever possible, the transmitter should be
located so there is a clear line of sight from
WHEN USING ONE TRANSMITTER
transmitter to receiver. The fewer obstructions
TO ACTIVATE TWO OR MORE
between transmitter and receiver, the greater
RECEIVERS IN SUCCESSION,
the possible range and the less chance of mis-
ALLOW APPROXIMATELY 3-4
fire. Maximum operating ranges for various con-
S E C O N D S DELAY BETWEEN
ditions are given in paragraph 1-11.
FIRINGS.
2-6
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