MIL-HDBK-162A
Volume 1
15 December 1965
Section 1
ITEM NAME: CODER-DECODER GROUP
TYPE: AN/GPA-78
Mounting: The cabinet containing most of the
Indicator as a target IFF response. Provisions are
Coder-Decoder Groups components may be
incorporated to differentiate between Mark X IFF
located in any convenient position within the
response, decoded response, and IM-99 response.
limit of cable lengths. Also, the six controls are
RELATION TO SIMILAR EQUIPMENT
mounted on the Radar Set Plan Position
Indicators by means of plates.
None.
TECHNICAL DESCRIPTION
Cabling Requirements: Cables not furnished are
recovered from the existing IFF system
Power Requirements: 115 plus or minus 11.5v, 50
installation, or fabricated from material on hand
to 110 cps, single ph, at 2.6 amp, maximum.
to satisfy the installation.
Operating Temperature Limits: 29C to 52C (minus
20.2F to 125.6F)
Related Equipments: The Coder-Decoder Group is
Input Pretrigger: Precedes radar main bang by 37.2
designed to operate in conjunction with the
plus or minus 1.0 usec
AN/UPX-6,
AN/APX-25,
an
external
Repetition Frequency: 150 to 500 pps
programmer and readout equipment.
The
Internal Self-Trigger Frequency:
Coder-Decoder Group also integrates with the
Adjustable between 150 and 125 pps
IFF equipment of Radar Set AN/FPS-3, Radar
INSTALLATION CONSIDERATIONS
Set AN/MPS-7, or Radar Set AN/FPS-8 to
provide SIF capabilities to Mark X IFF.
Siting: Provisions have been made in the radar
installations AN/FPS-3, AN/MPS-7, or AN/FPS-
8 to accommodate the Coder Decoder Group.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Coder-Interrogator Set
1
KY-27,1/GPX
Video Decoder KY-275/GPX
6
Power Supply PP-2191/GPX
Coder-Decoder Control
6
C-2738/GPX
Cabinet CY-2652/GPA-7
1I
Plate MT-2209/GPX
6
REFERENCE DATA AND LITERATURE
TECHNICAL ORDERS:
31P1-2GPA78-5
AN/GPA-78: 2
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