Volume 1
MIL-HDBK- 162 A
Section 3
15 December 1965
AN/SPN-4
Type of Presentation: One 7-in. PPI
FUNCTIONAL DESCRIPTION
Range Scales: 1.5, 5, 15, and 50 mi
Pulse Repetition Rate: 1, 000 pps 5%
The AN/SPN-4 is a commercial radar navigational
system designed for non-combatant ships.
Pulse Width: 0.4 sec
Horizontal Coverage: 360 deg
RELATION TO SIMILAR EQUIPMENT
Antenna Rotation Speed: 7 rpm at 60 cps
Range Resolution: 100 yd
The AN/SPN-4 is identical to Raytheon's Mariners
Azimuth Resolution: 5 deg
Pathfinder Radar Set Model CX1002 and similar to
Range Accuracy: 100 yd at 100 to 5, 000 yd;
Model CX-1086 except for a modification kit required for
2% at 2.5 to 50 mi
true bearing readings.
Azimuth Accuracy: 2 deg between antenna and
indicator
TECHNICAL DESCRIPTION
Horizontal Beam Width: 3.5 deg
Vertical Beam Width: 11.5 deg
Frequency: 3055 45 mc
Receiver Noise Factor: 15 db
Tuning: AFC
Range, Min: 100 yd
Video Output: Limited at 1.75 t0.25v across 75
Peak Power Output: 15 kw
ohms to min bandwidth of 3 mc
Operating Voltages and Power Requirements:
115 vac 10%, 1-ph, 50 to 70 cps,
INSTALLATION CONSIDERATIONS
1 kva at 60 cps
Not available.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Receiver-Transmitter Unit
1
60
23-1/2
26
525
RT- 142/SPN-4
Antenna AS-404/SPN-4
1
89
53
150
Plan Position Indicator
1
14
14-
24
50
IP-116/SPN-4
REFERENCE DATA AND LITERATURE
Technical Manual:
NAVSHIPS 91052
AN/SPN-4: 2
Previous Page
