Volume 1
MIL-HDBK-162A
Section 1
15 December 1965
ITEM NAME: AMPLIFIER-INDICATOR GROUP
TYPE: AN/GPA-26
Synchro Control Data - One speed and
alternate trace presents IFF return signals and/or
16-speed synchro ant. azimuth data from
mapping information, as desired, and rotates with the
AN/MPX-7
antenna of the Interrogator Set or with the map table of
IFF Trigger - Positive, 20v, 1 usec trigger
the Electronic Mapping Group.
This simultaneous
preceding ea radar by either 12.2 usec or
display capability greatly increases the operational utility
36.6 usec as selected by Trigger Select
of the Close Support Control Set AN/MSQ-1 of which
switch on Indicator Control
the parent Radar Set, the Interrogator Set, and the
Map Triggers - Positive, 35v, 1 usec trigger
Electronic Mapping Group are components parts.
coincident with the radar triggers.
Although designed for immediate Mark X operation with
Interrogator Set AN/MPX-7, Amplifier-Indicator Group
AN/GPA26 has provision for future SIF operation
INSTALLATION CONSIDERATIONS
through the use of an AN/GPA-36 Control Unit.
Siting: The AN/GPA-26 is designed for installation
in Radar Trailer K78 of Radar Set AN/MPS-9.
RELATION TO SIMILAR EQUIPMENT
Mounting: For mechanical reasons, IP-431/GPA-26,
None.
PP-1803/GPA-26, and C-2258/GPA should be
installed in the order named.
The other
TECHNICAL DESCRIPTION
components may be installed in any convenient
Presentations available:
sequence.
Operational Mode I - Radar only
Operational Mode 2 - Radar and IFF
The interconnecting cables should be installed last.
Operational Mode 3 - Radar and Maps
Operational Mode .1 - Radar, IFF, and
Cabling Requirements: The interconnecting cables
Maps
are of two basic types:
Input Power Requirements:
800 va of single ph, 115v, 60 cycle
inter-van cables, of which there are 5, and intra-van
power.
cables, of which there are 21. The inter-van
Four ranges provided: of 50,000 yd,
cables provide connections to Interrogator Set
100,000 yd, 200,000 yd and 360,000 yd.
AN/ MPX-7 which is located in a separate truck.
Input Signal:
The intra-van cables are of various lengths and
Pre-Trigger Gate - Negative, 60v, 44
are used inside the Radar Van to interconnect
usec gate occurs 18.8 usec prior to
the components of the Amplifier-Indicator Group
ea radar
with one another and with the Radar Set.
PPI Triggers - Negative, 8v, 0.8 usec
triggers at 110 pps
Related Equipments:
Amplifier-Indicator Group
Radar Track Gate - Positive, 3.5v, 1.6
AN/GPA-26 is designed for installation in the
usec gate, var in time with target
Radar Van of Radar Set AN/MPS-9.
It
range
constitutes a modification to the Radar Set by
Range Mark Triggers - Positive, 0.6
replacing the former PPI display system. The
usec triggers at 81.91 kc
AN/GPA-26 operates in conjunction with the
Radar Video
Radar Set, with an Interrogator Set AN/MPX-7,
IFF Video
and with a Video Mapping Group AN/GPA-30.
Map Video
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Azimuth and Range Indicator
1
IP-131/GPA-26
Indicator Control C-2258/GPA-26
1
Power Supply PP-1803/GPA-26
1
Electronic Control Amplifier
1
AM-1742/GPA-26
AN/GPA-26: 2
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