JP-l, JP-2, JP-3 SONIC LISTENING EQUIPMENT
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
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.
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-49429Literature.-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.