Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
AN/SPN-8, -8A
Type of Emission: Pulse
FUNCTIONAL DESCRIPTION
Peak Power Output: 40 to 60 kw
Pulse Rate: 4, 000 pps
The AN/SPN-8 and AN/SPN-8A are carrier-controlled
Pulse Width: 0.25 sec
approach systems used when visibility approaches zero.
The systems will guide aircraft from a position as far as
Nominal Carrier Output: 25 kw peak power for
six miles away to a position as close as 200 feet from
each type of emission
touchdown on the aircraft carrier. PPI's display the
Frequency Stability: 0.5 mc for receiver local
aircraft's position in relation to an ideal approach path.
oscillator, AFC, and magnetron
The AN/SPN-8 and -8A include units to compensate or
Receiver Output: 5v peak into 70-ohm line
correct for deviations from the roll, pitch, and yaw of the
IF. Frequency: 60 mc
carrier.
Eleven
radio
channels
and
ten
Operating Voltages and Power Requirements:
intercommunications channels are available. The radio
115v, 60 cps, 1-ph, 4.6 kva, 0.5 amp max start-
channels transmit instructions to, and receive responses
ing current; 115v, 40 cps 4%, 3-ph, 4.5 kva
from, the pilot of the aircraft. The intercommunications
delta-connected negative phase sequence
channels provide contact with other stations aboard the
Antenna Type: Searchlight beam
carrier. The AN/ SPN-8 or -8A controllers direct the pilot
Antenna Feed: X-band horn
along an ideal approach path until the aircraft is visible
Antenna Gain: 33 db
to the landing signal officer. If the pilot does not receive
Horizontal Beam Width: 1.5 deg
directions from the landing signal officer at the 200-foot
Vertical Beam Width: 6 deg (between half-power
minimum range, a wave-off is given by the final
points)
controller.
Tilt Angle: 5 deg above and 2 deg below hori-
zontal
RELATION TO SIMILAR EQUIPMENT
Scanning Data: 100 deg arc in azimuth with 3
oscillations per second
None.
TECHNICAL DESCRIPTION
INSTALLATION CONSIDERATIONS
Frequency: 9000 to 9180 mc continuously variable
Not available.
Range: 6 naut mi (max); 200 ft (min)
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Receiver-Transmitter Group
1
50.25
21.0
26.88
620
OA-3 64/SPN-8
Indicator Group OA-155/SPN-8
1
44.50
25.5
26
466
Indicator Group OA-156/SPN-8
1
44.50
25.25
26
477
Indicator Group OA-157/SPN-8
1
44.50
25.25
26
472
Antenna AS-477/SPN-8
1
42
32.38
36.12
535
Radome CW-205/SPN-8
1
102
32.38
82
410
Tuned Cavity FR-68/UP
1
20.26
15.06
19.59
15
Indicator Control C-1063/SPN-8
1
7.76
3.50
4.56
3
AN/SPN-8: 2
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