MIL-HDBK-162A
Volume 1
15 December 1965
Section 1
ITEM NAME: RADAR SET
TYPE: AN/FPN-1(XN-2)
Precision Azimuth and Elevation: 6 naut mi
information is translated by the radar set to lateral and
Pulse Data
vertical deviation from the selected glide path, and the
Pulse Repetition Frequency: 2000 pps
pilot of the incoming aircraft is instructed verbally as to
Pulse Duration: 0.5 usec
corrections he must make to keep on the glide path.
Antenna Beam Dimensions
Search Antenna: Cosecant squared pattern,
Through these instructions the pilot is guided to a
with nose of beam 2.75 deg above horizontal
height of 75 feet or less above the runway and to within
adjustable for 2 deg to 10 deg.
50 ft of the runway's center line, enabling him to touch
Coverage 5000 ft altitude. Azimuth width of
down under visual control in the usual manner.
beam 5 deg max.
Height Finder Antenna
RELATION TO SIMILAR EQUIPMENT
Azimuth: 4 deg wide
None
Elevation: 0.6 deg high
TECHNICAL DESCRIPTION
Precision Azimuth Antenna
Radar Operating Frequencies
Azimuth: 1.2 deg wide
Search System: 2880 plus or minus 20 mc
Elevation: 2 deg high
Height Finder System: 9150 plus or minus 10 mc
Precision Elevation Antenna
Precision Azimuth System: 9040 plus or minus 10
Azimuth: 3.6 deg wide
mc
Elevation: 0.6 deg high
Precision Elevation System: 9010 plus or
Scanning Ranges and Rates
minus 10 mc
Search Antenna: 360 deg at 30 rpm
Communications Operating Frequencies
Height Finder Antenna: 20 deg in elevation
Transmitting (hf): 2 to 18 mc
at 1/2 cycle (1 sweep) per sec.
Receiving (hf): 1.5 to 9.0 me
360 deg controlled rotation at 5.75 rpm
Transmitting (vhf): 100 to 156 me
Precision Azimuth Antenna: 20 deg electrical scan
Receiving (vhf): 100 to 156 mec
in azimuth at 1 cycle (2 sweeps) per sec, 7 deg
Power Output
mechanical tilt in elevation.
Radar
Radar Bandwidths (All systems)
Search System: 150 kw min
Intermediate Frequency: 4.0 mc
Height Finder System: 35 kw min
Video Frequency: 1.75 mc
Precision Azimuth System: 35 kw min
Operating Power Requirements: 115v ac,
Precision Elevation System: 35 kw min
60 cps, single ph, 40 kw.
Communications
INSTALLATION CONSIDERATIONS
Band (vhf): 8w
Related Equipment: (Required but not Supplied) (1)
Band (hf): 100w
Wattmeter "S" Band TS125/AP; (1) Signal
Magnetron Tube Currents
Generator "S" Band TS-14/AP(LAD); (1) Echo Box
Search System: 25 ma
"S" Band TS-270/UP; (2) Wattmeter "X" Band
Height Finding System: 12.5 ma
TS36/AP; (2) Signal Generator "X" Band TS-
Precision Azimuth System: 12.5 ma
191/UP; (2) Echo Box "X" Band TS218/UP; (3)
Precision Elevation System: 12.5 ma
Fluxmeter TS-15A/AP; (4) Tube Tester OCL; (4)
Range Limits
Voltohmmeter OCR; (1) Megger OCW; (4) Cap and
Search System: 30, 20, 10 and 6 naut mi
Resistance Bridge CLB60007; (3) Crystal Rectifier
Height Finder System: 20 naut mi slant
Test Set TS-268/U; (4) Oscilloscope TS34A/AP; (1)
range, 12,000 ft altitude
Test Set (Communications) IE-35A; (3) Voltage
Divider TS-89/AP; (3) Vacuum Tube Voltmeter
Model 62.
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENTS
QTY
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Antenna Mount AB-104/GPN-2
1
32 x 46-1/2 x 54
375
Antenna Mounting AB-136(XN-1)/FPN-1
1
18 x 26 x 50
548
Antenna Tower AB-138(XN-1)/FPN-1
1
230 x 230 x 706
25000
Antenna Tower AB-139(XN-l)/FPN-1
1
230 x 230 x 706
25000
Preamplifier AM-29/MPN-1A
6
3 x 4 x 7-3/4
3
AN/FPN-1(XN-2): 2
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