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FUZE, PROXIMITY: M728 |
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Filler and Weight | ||
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| NA, 0 | |||
| Body and Overall Weight | |||
| NA, 2.19 lb | |||
| Color | |||
| NA | |||
| Type of Round, DODIC | |||
| Proximity, 1390-N463 |
| Description: |
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| The fuze contains a radio continuous wave transmitter/detector with antennas and a power supply which performs the target detection function. A nose cone is fixed to a rotatable setting ring which has a single index line. The setting ring is connected to a clockwork timing mechanism within the fuze sleeve which energizes the proximity element u on approach to the target. In addition, a PD element is included to detonate the projectile on impact, or if the proximity element fails to operate. Graduations from 5 to 100, representing seconds to target, and a PD set line are inscribed around the shoulder of the sleeve. On this model, the PD mark coincides with the 90-second proximity setting. The plastic nose cone of the fuze has an anti-static protective coating, The setting ring and sleeve are metal. The slot in the setting ring is for time setting only. Slots in the fuze sleeve are for the fuze wrench when assembling the fuze to the projectile. The fuze is shipped with the index mar alined with the 10-second mark on the fuze sleeve. The major difference between the M514A1E1 and the M728 is that the latter has a black anti-static coating which prevents the fuze from functioning prematurely during some adverse atmospheric conditions. |
| Use: |
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| Proximity Fuze M728 is the latest model of the adjustable delayed-arming type designed for use with projectiles fired from 4.2-inch mortars, 105mm and 155mm howitzers, 175mm gun, and 8-inch howitzers against surface targets. |
| Functioning: |
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| Fuzes are set to the calculated time of flight of the projectile to target unless point detonation is desired. Setback from weapon firing releases the timing mechanism and initiates the power supply and point detonation arming. The fuze is armed for point detonation after 3 seconds of flight. Radio wave transmission is initiated 5 seconds prior to set time followed by proximity arming of the electric primer 3 seconds prior to set time. When any part of the radio wave front is reflected to the fuze from the target, an interaction or doppler signal occurs between the reflected and transmitted wave. When the doppler signal reaches a predetermined amplitude, an electronic switch activates the explosive train at an optimum distance from the target. If the proximity mode does not function, the projectile will be detonated on impact by the PD element. |
| Munition Components: |
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| Data Source: |
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| TM 43-0001-28 |
| Munitions Tech Data Sheet: |
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