H-28/GR

Electrical Chest Set H-28/GR is composed of a transmitter assembly, chest unit, and cord assembly. The equipment is used as a microphone with either wire or radio equipment. Provision is also made for connecting a headset for two way communication. This chest set may be used with Remote Control Equipment AN/TRA-2, Radio Control Central AN/TRQ-1 or Radio Set AN/CRC-3.

Specifications

CONSISTS OF

:1 Chest Unit H-17/GT

1 Cord Assembly CX-660/GR

1 Dummy Plug Assembly Drawing Number SC-D-19222

PHYSICAL DESCRIPTION

Dimensions: (Chest Unit)

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

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

Height - 6 inches (152.40 mm)

Weight - Not rated

Microphone Data

Type - Carbon

Mounting - Swivel

Cord Data

Length - Not rated

Number of Conductors - 3

Number of Connectors - 2

Connector Designations

JK-53 Plug (Chest Set End)

PL-68 Plug (System End)

MICROPHONE

INPUT

Operating Current - 325 milliamperes, maximum

OUTPUT

Nominal Impedance - 28 ohms

Frequency Range - 400 to 3,200 cps

SWITCH BOX

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 PL-54

Environmental Limitations

Equipment Operating:

Temperature - 40° F to +131° F

Elevation - Up to 10, 000 feet above sea level

Relative Humidity - Up to 98 percent

Equipment Non-operating:

Temperature - 80° F to + 160° F

Elevation - Up to 50, 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-17462

SC-D-19222

ARCS Research and Development Corp Standardization of Chest Sets Final Report :Technical Analysis Phase Contract DA36-039, SC66416

MSS 5965-2