H-18/T

Chest Set, electrical, H-18/GT is a telephone type transmitter mounted on a chest plate by an adjustable steel arm. This equipment is used with Radio Set AN/CRD-2, Radio Set AN/TTG-1, Switchboard BD-71, Switchboard BD-72, Switchboard BD-91, Switchboard BD-101, Flash Range Set GR-4, Flash Range Set GR-8, Radio Set AN/TRL, Switchboard BD-110, Radar Set AN/FPG-2; Telephone Central Office Set TC-1, Telephone Central Office Set TC-2, and Telephone Central Office Set TC-4.

Specifications

CONSISTS OF

1 Chest Unit H-17/GT

1 Cord CX-67/GR

1 Signal Strap ST-25

1 Switch

PHYSICAL DESCRIPTION

Dimensions: (Chest Unit)

Height - 6 inches (152.40 mm)

Width - 2-1/4 inches (57.15 mm)

Depth - 4-1/2 inches (114.30 mm)

Weight - Not rated

Microphone Data

Type - Carbon

Mounting - Chest Plate Mounted

Cord Data

Length - Not rated

Number of Conductors - 3

Number of Connectors - 2

Connector Designation - JK-53 Plug (Chest Set End) U-31/GT (System End)

INPUT

Operating current - 60 milliamperes

OUTPUT

Nominal Impedance - 30 ohms

Frequency - 300 to 3,000 cps

Switch Function

Connects Microphone circuit and control circuit contacts

Switch Electrical Ratings

Current Rating - 2 amperes control circuit 150 ma microphone circuit

Connector Designation - Microphone Jack mates with Plug PL-291 Headset Jack mates with Plug PL54

Environmental Limitations

Equipment Operating:

Temperature - 80° F to + 160° F

Elevation - Up to 10, 000 feet above sea level

Relative Humidity - Up to 100 percent including condensation caused by temperature changes

Vibration - No mechanical resonance below 55 cps

Reference FIles

MIL-C-13064

MIL-M-13189

SC-D-17105

ARCS Research and Development Corp Standardization of Chest Sets Purification Report Contract DA 36-039, SC66416, Final Report Technical Analysis Phase Contract DA 36-039, SC66416

MSS 5965-2