Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
AN/SPN-11, - 11X, - 11Y, - 11Z
Duty Cycle: 0.004
FUNCTIONAL DESCRIPTION
Pulse Repetition Rate: 1, 000 pps
Pulse Width: 0.4 sec
Radar Sets AN/SPN-11, -11X, -11Y, and -11Z are
shipboard radar navigational aids for small craft. They
Horizontal Beam Width: 1.9 deg
provide position data on ships and landmarks at ranges
Vertical Beam Width: 20 deg
of from 75 yards to 20 nautical miles. The sets provide
Range Resolution: 75 yd
anticollision data by observing positions and courses of
Bearing Resolution: 2 deg
ships on the open sea; piloting information by observing
Range Scales: 1, 3, 8, and 20 naut mi
positions of buoys and other markers in channels and
IF. Frequency: 30 mc
harbors; bearings and ranges of known landmarks to
IF. Bandwidth: 5 mc
plot the position of the radar-equipped craft; and storm
Receiver Sensitivity: -90 dbm
warning data by observing and plotting movements of
Antenna Feed: Horn type, 400 to 500 ohms input
heavy rain or snow squalls.
Antenna Speed: 17 rpm
RELATION TO SIMILAR EQUIPMENT
None.
INSTALLATION CONSIDERATIONS
TECHNICAL DESCRIPTION
Siting: The antenna should be high enough to
permit the radar beam to clear large ship-
board structures. The front end of the an-
Frequency: 9320 to 9430 mc
tenna base must face directly ahead and be
Range: 20 naut mi (max); 75 yd (min)
accurately aligned in a fore and aft direction.
RF Power Source: Magnetron
Mounting:
Power Output: 30 kw (peak); 12w (avg)
Cabling Requirements: The waveguide run from
Operating Voltages and Power Requirements:
the base of the antenna to the receiver-trans-
AN/SPN-11 - 115 vac, 400 cps, 1-ph
mitter must be as short and straight as pos-
AN/SPN-11X - 115 vdc, 1, 000w
sible.
AN/SPN-11Y - 32 vdc
Related Equipment:
AN/SPN-11Z - 24 vdc, 1, 000w
Type of Presentation: One 7-in. PPl
PRINCIPAL COMPONENTS ANC PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
AN/SPN-11
Radar Receiver-Transmitter
1
RT-268( )/SPN-11
Azimuth and Range Indicator
1
IP-193( )/SPN-11
Antenna AS-599( )/SPN-1l
1
Resistance Element HD-123( )/SPN-11
1
Motor Generator (AC)
1
Motor Generator (DC)
1
Circuit Breaker
1
Starter Motor
1
Switch Box SA-284( )/SPN-11
1
Voltage Regulator CN-192( )/SPN-11
1
AN/SPN-11: 2
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