Mark 84 Mod 1 Signal Underwater Sound Device

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Mark 84 Mod 1 Signal Underwater Sound Device


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Mark 84 Mod 1 Signal Underwater Sound Device.

MK-84 MOD 1 SUS. Air to Submarine Communications Device.

The SUS MK-84 Mod 1 underwater sound signal device is an expendable electro-acoustic device which provides one-way acoustic communications with submarines. It can also be used to simulate the drop of an ASW weapon during a tactical exercise. It may be dropped or deployed from fixed-wi aircraft or helicopters as well-as by over-the-side ship-launched methods

The SUS MK-84 Mod 1 is able to transmit any one of five pre-selected coded acoustic signals, each of which may convey a predetermined message to the submarine. Four of these signals consist of a continuous tone that alternates in frequency in accordance with a timing sequence defined in the coded table (see specification). The fifth code is a continuous tone at a single frequency. Third harmonics of the fundamental frequencies are also generated at levels slightly less than those of the fundamentals. A five position switch on the side of the unit accomplishes the settings.

The MK-84 is designed to provide a source level of 160 dB/uPa within 2 seconds of water entry throughout the life of the unit.

Electronic SUS No Explosives

Activation Following Water Entry Seconds (max)


#70 Seconds

Multiple Tone Selections (Codes) Five

Under Water Decent Rate #15 ft per Second

NSN 1360-01-037-0588

Sonobuoy Tech Systems supplies US-specified sonobuoy products and support to the international market. Phone: 260.248.3503 Fax: 260.248.35 TO Website:

Approx length 15", Approx width 3", Approx weight 6lbs.

Pictures are stock images of our inventory. Unless otherwise noted, you will not be receiving the exact item shown in the pictures. The pictures are representative of the item's general condition. The item you receive might be slightly better, or worse, condition than was shown in the pictures.

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