Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
AN/APA-57
DC Supply - 28v 5%, 8 amp
information to Dead Reckoning Tracer equipment and
true heading data to the antenna of Radar Set AN/APS-
Data Voltages:
20A. Although the AN/APA-57 is designed specifically
Heading Signal - 0 to 0.3v, 1-ph, 400 cps from
for use with Indicator Assembly AN/APA-56 or Indicator
G-2 compass system or 0 to 9v, 1-ph, 400 cps
Group AN/APA-81 equipments, it may also be used with
from adapter.
other radar indicators provided with means for sweep
Air Speed Signal - 0 to 65v, 3-ph, 40 to 160
offset.
cps from air pump or 0 to 12v, I-ph, 400 cps
from air speed transmitter.
RELATION TO SIMILAR EQUIPMENT
Wind Signal - 0 to 1.5v, 1-ph, 400 cps
Output Voltages:
Similar to AN/APA-57A except for use of different
Heading Signal- 0 to 12v, 3-ph, 400 cps ac
Computer-Indicators and to AN/APA-57B, and AN/APA-
synchro output; azimuth displacement signal
57C. The basic differences are the source of air speed
relative to true north, for use at antenna of
information and the manner of coordinate resolution and
Radar Set AN/APS-20.
combination with wind data.
Ground Position Coordinates: -150 to +150 vdc
potentiometer outputs. Initial fix corresponds
to N-S and E-W ground displacement coordi-
nates for sweep displacement circuits of the
TECHNICAL DESCRIPTION
PPI.
Input Power Requirements:
INSTALLATION CONSIDERATIONS
AC Supply - 115v, delta connected or 208v
wye connected, 5%; 3-ph; 400 cps 5%; ph-A
Not available.
45 va, ph-B 75 va, ph-C 26 va. Ph-A must be
supplied from same source as that used for
the G-2 compass system.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Computer- indicator
1
5-5/16
7-3/8
11-13/16
8-3/5
CP-32/APA-57
Amplifier-Wind Servo
1
7-5/8
7-5/8
21-1/2
35
AM-202/APA-57
Control C-441/APA-57
1
1o- 5/8
15-3/8
17- 1/2
51
Air Pump MX-912/APA-57
1
9-5/16
9-5/16
9-5/8
8
Inertia Switch SA-235/APA-57
1
5-5/16
5-5/16
10- 1/4
5
A.P.I. Controller AN5843-1
I
3-1/4
3-1/4
4-5/32
1-3/4
REFERENCE DATA AND LITERATURE
Technical Manual:
AN16-30APA57-3
Specification:
NAVAER M-733A
AN/APA-57: 2
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