Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: AIRCRAFT APPROACH CONTROL CENTRAL
TYPE: AN/SPN-35
Operating: Sea level to 6000 ft Non-Operating: Sea
one mile from the ship. The radar system may also be used
level to 25,000 ft
for air traffic control, height finding, and radar surveillance of
Winds
aircraft.
Operating: 40 knots Non-Operating: 100 knots
Sand and Dust: As encountered in arid regions
RELATION TO SIMILAR EQUIPMENT
(particles 10-20 microns in size)
None.
Elevation Antenna
TECHNICAL DESCRIPTION
Beamwidth: 1/2 power
IF. Delay Line
Vertical: 1.1u max
Delay: 0.24 usec Impedance: 50 ohms
Horizontal: 3.5 max csc2 to -15
Attenuation: 8 db
Gain: 35 db
Control Indicator Group
Polarization: Vert or circular
General
Scan Coverage: Scan -1 to plus 10,
Number of Indicators: 2, 3 or 4
or -1 to plus 35
Indicator Presentation: PPI or beta
can be displayed in indicators in search
Horizontal Servo: plus or minus 15
and PREC modes respectively; PPI display or
Vertical Height: 8 ft
beta display on any indicator when master
Horizontal Width: 2 ft
indicator is in SIMULT mode
Azimuth Antenna
Remoting: 500 ft or less
Beamwidth: 1/2 pwr
Surveillance: (Search)
Vertical: 3.5max csc 2 to 30
Type Display: PPI (10 in.)
Horizontal: 1.3 max
Ranges: Linear (5-, 10-, 20- and 40-mi
Gain: 37 db
sweeps)
Polarization: Horiz or circular
Offset Ranges: Full radius (except 40-mi)
Scan Coverage: 30, 60, and 360
Range Marks: i-mi spacing on 5- and 10-
Tilt: -1 to plus 25
mi sweeps; 5-mi spacing on 20- and 40-mi sweeps;
Vert Ht.: 4.5 ft; Horiz Width: 6.5 ft
one 1/4 mi range mark, separately selected and
separately adjustable on 5- and 10-mi ranges
Operating Frequency: X-band (9.0 to
Range Mark Accuracy: plus or minus 1%
9.16 giga cyc)
Azimuth Display: 300 or 600 sector scan
Pulse Width: 0.2 or 0.8 usec
or 360 in SIMULT mode, within a -1 to plus 10
PRF: 1200 pps
elevation sector
Peak Power Output: 200 kw nom
Elevation Display: -1 to plus 10 or
Receiver
-1 to plus 35 within a 300 azimuth
Minimum Detectable Signal: -101 db
section scan
Receiver IF. Bandwidth: 2 mc for 0.8
Date Rate: One azimuth and elevation
usec pulse; 7 mc for 0.2 usec pulse
picture every sec in NORM code; one azimuth and
Receiver FTC: Selected by operator
one elevation picture every 2 sec in 600 AZ mode;
Receiver STC: Selected by operator
approx 16 azimuth and 24 elevation pictures every
Receiver Tuning: Local oscillator
60 sec on precision display in SIMULT rode; od{
tune from operator's position
azimuth and one elevation picture every sec in 35
RF Noise Figure: 10.5 db
EL mode
IF. Preamplifier
Glideslope Cursors: Adjustable to any
Gain: Var (plus 27 db to -13 db)
glideslope from plus 1 to 45 in elevation
Bandwidth: 13 mc
Runway (Canted Deck) Cursors: 2 electronic preset
Center Frequency: 60 mc
cursors adjustable to any heading within the siting
Noise Figure: 2.8 db
criteria
IF. Amplifier
Service Conditions
Gain: Var (plus 84 db to plus 34 db,
Ambient Temperature
narrow band); var (plus 79 db to plus
Operating: -40C (-40F) to plus 50C
28 db, wide band)
(plus 122F)
Bandwidth: 2 mc or 7 mc
Non-Operating: -62C (-800F) to plus
Center Frequency: 60 mc
Dynamic Range: 30 db
75C (plus 167F)
Log IF. Amplifier
Relative Humidity: No adverse effects
IF. Gain: 70 db
up to 95% relative humidity (operating and non-
Bandwidth: 8 mc
operating)
Altitude
AN/SPN-35: 2
Previous Page
