Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: INDICATOR GROUP
TYPE: AN/SPA-51
Bearing Accuracy: Within 2 deg at all antenna
synchro voltages and the ability to display AN/SPS-32
speeds
radar video and IFF target responses. The mode of
Cathode-Ray Tube Diameter (PPI): 10-1/2 in.
operation of the indicator group is chosen by a RADAR
Number of Operators Required: 1
SELECTOR switch mounted on the front panel.
INSTALLATION CONSIDERATIONS
RELATION TO SIMILAR EQUIPMENT
Siting: Azimuth-Range Indicator IP-538/ SPA-51 and
Indicator Group AN/SPA-51 is essentially the same
Electrical Standarized Components Case CY-
as Indicator Group AN/SPA-33 except that AN/SPS-32
1864/SPA-BC; Combat Information Center.
radar video (and IFF target responses) can also be
Power Supply PP-560D/SP; where convenient, up
displayed by selecting positions 4 or 10 of the RADAR
to 150 feet (maximum cable length) from the
SELECTOR switch.
Other differences are:
an
indicator. Power Transformer TF-129A/SP; where
extension of range from 300 to 400 miles, deletion of
convenient, up to 60 feet (maximum cable length)
external cursor bearing information transfer, elimination
from the power supply. Electronic Gate TD-
of the range and bearing buzzer, and the display of
326/SP; where convenient, up to 75 feet
AN/SPS-26 radar in positions 2, 3, or 9 of the RADAR
(maximum cable length) from the indicator and
SELECTOR switch.
the power supply.
TECHNICAL DESCRIPTION
Mounting: All units except Electrical Standardized
Pulse Repetition Frequency: 60 to 3000 per sec
Components Case CY-1864/SPA-BC are shock
Power Requirements: 115v plus or minus 10%; 60
mounted and bolted into place.
cycles plus or minus 3 cycles, single ph
Mounting Dimensions: length by width by depth.
Power Demand: 1847 va
Azimuth Range Indicator
Power Dissipation: 1700w (approx)
IP-538/SPA-51: 63 in. 41 in. 45 in.
Power Factor: 0.93 pf (approx)
Power Supply PP-56OD/SP: 40 in. 28 in. 31 in.
Video Input: 1 to 2-1/2v (pos)
Power Transformer TF-129A/SP: 9 in. 24 in. 13
Trigger Input: 5 to 50v (pos)
in.
Antenna and Trace Rotation: 0 to 40 rpm
Electronic Gate TD-326/SP: 41 in. 15 in. 16 in.
Range
Components Case CY-1864/SPA-BC: 16 in. 19
Centered PPI: 4 to 400 mi continuously var
in. 16 in.
Off-Centered PPI: 4 to 400 mi continuously var
Related Equipment: (Required, but not Supplied)
Range Accuracy
Video Decoder KY-80/UPA-24, Radar Set Control
300 to 10,000 Yards: plus or minus 100 yds
C-1008/UPA-24, 5G synchro, 6G synchro
10,000 to 72,000 Yards: plus or minus 1% of
interconnecting cables, and terminal tubes.
actual range
72,000 Yards to 400 Miles: plus or minus 2% of
actual range
PRINCIPAL COMPONENTS AND PHYSICAL DATA
SHIPPING DATA
COMPONENT
BOXES
OVERALL DIMENSIONS
UNIT WT.
(NR.)
(Inches)
(Pounds)
Azimuth-Range Indicator IP-53B/SPA-51
1
35 x 39-1/2 x 46-3/4
685
Power Supply PP-560D/SP
1
33 x 27-1/2 x 36-3/4
474
Power Transformer TF-129A/SP
1
30-3/4 x 17-1/2 x 10-3/4
156
Electrical Standardized Components Case
1
21-5/8 x 20-1/8 x 18-1/8
124
CY-1864/SPA-BC
Electronic Gate TD-326/SP
1
AN/SPA-51: 2
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