Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
AN/SPN-5A, -5AX, -SAY, -5AZ, -5B
Range Resolution: 80 yd on ranges using 0.25
FUNCTIONAL DESCRIPTION
sec pulse
Radar Sets AN/SPN-5A, -5AX, -5AY, -5AZ and -5B
Azimuth Resolution: 2 deg
are search radar sets, used in fixed installations on
IF. Frequency: 30 mc
ocean-going vessels. The sets are navigational aids
Receiver Sensitivity: -92 dbm
that furnish position information on other vessels, buoys,
Receiver Bandwidth: 5.5 mc
channel markers, and coast lines. Target position
Operating Voltages and Power Requirements:
information consists of range and bearing.
AN/SPN-5A - 115 vac, 60 cps, 1-ph, 12 amp,
0.85 pf
AN/SPN-5AX - 115 vdc, 20 amp
RELATION TO SIMILAR EQUIPMENT
AN/SPN-5AY - 230 vdc, 24 amp
AN/SPN-5AZ - 230 vac, 60 cps, 1-ph, 6.5
amp, 0.85 pf
The AN/SPN-5A, -5AX, -5AY, -5AZ, -5B are similar
AN/SPN-5B - 115 vac, 60 cps, 1-ph, 1, 380
to, and functionally interchangeable (as a whole) with,
va, 0.85 pf
AN/SPN-5, -5X, -5Y, -5Z except the AN/SPN-5B
Duty Cycle: 0.00083
includes de-icing, true bearing, and variable range-
Horizontal Beam Width:
marker features.
1.8 deg at half-power points
Vertical Beam Width:
19 deg at half-power points
TECHNICAL DESCRIPTION
Antenna Scanning Rate: 10 rpm or 60 deg per sec
Frequency: 9320 to 9430 mc
Range: 81, 070 yd (max); 80 yd (min)
INSTALLATION CONSIDERATIONS
Power Output: 30 kw (peak); 25w (avg)
Pulse Repetition Rate:
Siting: If possible, locate the antenna on either
1.5-, 4-, and 8-mi ranges, 3, 000 pps;
side of the ship, rather than amidships. The
20-, and 40-mi ranges, 750 pps
waveguide run should not exceed 75 ft from
Pulse Duration:
the base of the antenna unit to the top of the
1.5-, 2-, 4-, and 8-mi ranges, 0.25 sec;
transmitter-receiver unit.
20-, and 40-mi ranges, 1 sec
Mounting:
Range Accuracy: +1%
Cabling Requirements:
Azimuth Accuracy: 2 deg
Related Equipment:
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Radar Receiver-Transmitter
1
53-3/4
19-3/8
20-1/2
326
RT-161/SPN-5 (5B only)
Radar Receiver-Transmitter
1
53-3/4
19-3/8
20-1/2
326
RT-161A/SPN-5 (5A, 5AX, 5AY,
5AZ only)
Control Indicator C-1091/SPN-5A
1
52-1/2
18
28-3/4
230
(5A, 5AX, 5AY, 5AZ only)
Range Computer CP-142/SPN-5A
1
17-1/2
5-1/4
6
Radar Indicator-Control IP-51/SPN-5
1
47
18
28-1/2
230
(5B only)
Azimuth Indicator ID-333/SPN-5A
1
14-1/2
4-3/4
11-3/8
AN/SPN-5A: 2
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