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JP-l, JP-2, JP-3 SONIC LISTENING EQUIPMENT


Model JP-3 reciever and training handwheel.
Model JP-3 reciever and training handwheel.

Use.-Submarines.

Contract number.-NXssl7436.

Description.- Model JP-1 JP-2, and JP-3 equipments are used on submarines while submerged to obtain bearings on other vessels by directional detection of underwater sounds. They can also be used to listen for own ship's noise.
Models JP-2 and 3 differ from JP-1 in the circuits of the amplifier; JP-2 and 3 are alike except for the method of mounting the hydrophone.

Training system characteristics.-Training is manual; the hydrophone is mounted topside on a shaft operated by a handwheel near the amplifier. With the aid of a "magic eye" tube, the operator can train on a source of noise with an accuracy of +- 1 1/2 degrees. Relative bearings are read from a dial at the handwheel. The hydrophone is not retractable.

Power supply.-120 volts d. c.

Hydrophone.-The hydrophone is a directional, line type, 3 feet long. It is magnetostrictive, polarized by permanent magnetization. Frequency response is from 100 to 40,000 cycles.

Tube complement.-1 type 6J7, 4 type 6SJ7, 2 type 6G6-G, 1 type 6H6, 1 type 6E5, 1 type 3-38A.

Receiver specifications.-The amplifier consists of four high gain, resistance coupled stages and a push pull output stage; with a frequency response covering the range from 100 to 15,000 cycles. Filters, selected by a panel switch, permit the lower frequencies to be excluded in 3 successive steps, thus increasing the directivity and one step that decreases high frequency response. A propeller count tube, controlled by a switch, emphasizes the beating of a propeller to allow easier count of turns. The amplifier output is fed to a loud speaker or to two sets of headphones.
Power for the amplifier is supplied direct from the boat's batteries through a line filter which suppresses a-f and r-f noise.

Block diagram of JP-1 Sound Receiving Equipment
Block diagram of JP-1 Sound Receiving Equipment

                Dimensions and weights
          Units     Navy Type No. Height Width  Depth  Weight
                                  Inches Inches Inches Pounds
Amplifier (JP-l)       CDI-50138    11    21      10     57
Amplifier (JP-2 and 3) CDJ-50179    11    21      10     57
Line Filter            CDI-53136     7     5      15     19
Loudspeaker            CJS-49430    10     9      10     11
Hydrophone:
 JP-1                  COG-51053     8    40      10     50
 JP-2                  COG-51053A    8    40      30     50
 JP-3                  COG-51069     8    40      10     50
Headphones             CBD-49429
Literature.-Installation, Operation, and Maintenance Instructions for Model JP-1 Sound Receiving Equipment. Preliminary Installation, Operation, and Maintenance Instructions for Model JP-3 Sound Receiving Equipment. Maintenance and Trouble Shooting Instructions for Models JP-l, JP-2, and JP-3 Sound Receiving Equipment. Maintenance Manual for JP-l, JP-2, JP-3 Sonar Equipment (NavShips 900,043).

REFERENCES:

The information enclosed here is excerpted from:
Catalogue of Naval Electronic Equipment-April 1946- NavShips 900,116.

 

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Version 2.00, 11 Sep 2006