Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: COMPUTER-RECORDER GROUP
TYPE: AN/SPA-14(XN-1)
Plotter Accuracy: 0.015 of theoretically
speed and Own Ship1s Motion. The resulting plot on
correct positions.
the plotting board shows the path over a horizontal
reference plane of both the target and beacon relative to
Pen: 200 in. per sec
a fixed set of axis.
Arm: 100 in. per sec
Plotting Velocity: 3 in. per sec in any
direction without exceeding accuracy
RELATION TO SIMILAR EQUIPMENT
tolerance limit.
Arm Transfer: Pen can be relocated com-
Power Requirements: 115v, 60 cps, single
pletely across board in 2 sec upon trans-
ph, 30 amps for Unit 1, 20 amps for Unit
fer of arm plotting functions.
4.
Height Recorder
Heat Dissipation
Type: 2 pen instrument for recording
Unit 1: Approx 1000w (57 BTU per min).
2 independent variables simultaneously.
Unit 2: Approx 1300w per rack (73 BTU
Paper Speed: 1, 3, 5, or 15, in. per
per min).
minute.
Unit 3:
Approx 300w (18 BTU per min).
Scale Factors (Plotting Board): 2, 4, 8,
Unit 4:
Approx 180(w (105 BTU per min).
and 12 mi per in. to give max ranges of
Presentation: Permanently inked record on
30, 60, 120, and 180 mi for long limit.
plotting board of X vs. Y coordinates
Divide by 4 for short limit (50 mi max).
vs. height plot on height recorder.
Parallax and Own Ship's Motion: Own ship
Computer Accuracy: Output voltage within
can be off-centered from 0 to 180 mi
plus or minus 9.4% of theoretically
from center of plotting area (long
correct voltages, electro-mechanical re-
limit).
solving element and their driving
servos within 0.5% of range and lin-
INSTALLATION CONSIDERATIONS
ear angles and 0.1% for resolved
azimuth and elevation angles.
Not available.
Angular Speed of Target: 30 deg per sec
in relation to ship can be computed.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENTS
QTY
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Unit 1 Computer
1
23-7/8 x 35-3/4 x 71-7/8
1300
Unit 2 Computer
2
23-7/8 x 35-3/4 x 71-7/8
1200
Unit 3 Height Recorder
1
23-5/8 x 34-5/16 x 45-1/2
400
Unit 4 Plotting Board Assy
1
41-7/16 x 48-3/8 x 63-7/16
1250
Set of Accessories
1
REFERENCE DATA AND LITERATURE
Technical Manuals:
NAVSHIPS 92925
AN/SPA-14(XN-1): 2
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