e. Aligning the Transmitter to the Machine Gun. The transmitter must be aligned in the dry fire mode, using the dry fire trigger cable. To align the transmitter, you need a soldier wearing a MILES helmet and torso harness. The gun should already be mounted on a tripod and have the T&E attached.
(1) Position the soldier 50 to 75 meters away from the machine gun. Have him place a green controller key in his MILES receptacle and turn the key to the CONTROLLER position.
(2) Connect the trigger cable assembly to the receptacle on the rear of the MILES transmitter. Use the controller key to reset the system.
(3) Insert an orange weapon key into the transmitter receptacle and turn to WEAPON ON.
(4) Fire at the soldier by pressing the trigger cable button. Traverse the gun left and right, up and down, until the soldier's buzzer signals a "near miss." Hold the gun in that position.
(5) While he is being fired on, have the soldier move to his right until his buzzer stops. Have him mark that location.
(6) Have the soldier move to his left until the buzzer stops again. Have him mark that location.
(7) Have the soldier estimate the center between the two marks, and stand there.
(8) Cease fire. Without moving the barrel of the machine gun, adjust the sights until the soldier is seen through the rear sight aperture.
(9) Begin firing again and move the barrel up and down, noticing where the buzzer stops. Estimate the center of this up and down area and adjust the sight elevation to that point.
(10) Remove the trigger cable assembly and screw the protective cover onto the transmitter receptacle.
f. Resetting the Transmitter After a Kill. Remove the orange key from the transmitter. Use it to silence the "kill" indicator and the CVKI light. The transmitter will not fire with the key removed. When the controller resets the "kill" indicator, turn the transmitter to WEAPON ON and reinsert the orange key. Continue the mission.
g. Using Precautions. The following safety considerations apply to the M1A1 blank cartridge:
(1) Never fire blanks directly at personnel within 20 meters of the gun.
(2) Never fire blanks without wearing hearing protection.
(3) Never fire blanks when the temperature is below 0 degrees or above 120 degrees Fahrenheit.
(4) Never stand directly to the side of the weapon muzzle when blanks are fired.
(6) Never fire blanks in bursts in excess of 20 rounds.
(7) Always allow a cooling period between bursts to avoid overheating the gun.
The sighting bar is a locally fabricated device used for practicing the sighting and aiming exercise (Figure B-8). Paragraph 5-9 explains its use. This exercise requires the soldiers to look through the peephole and center on the front sight blade. The gunner adjusts the peephole until he is able to align the front sight blade in the center of it. The instructor will then review and critique the gunner on sight alignment. The device is also equipped with a scaled target for practicing sight picture. Once sight alignment is mastered, the gunner will be required to show a correct sight picture. This is done by adjusting the scaled target until the front sight plate is bottom center of it. Again the instructor will review and critique the gunner. This exercise will continue until the gunner has mastered the technique of sighting and aiming; this requires a lot of practice.
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