Volume 1
MIL-HDBK-162A
Section 1
15 December 1965
ITEM NAME: RADAR SET
TYPE: AN/FPN-28, AN/FPN-28A
Precision Elevation System: plus 2 deg
runway through the facilities of the precision system of
to plus 5 deg
the radar set.
Touch-Down Point Location Limits
The precision approach system is designed to
Minimum: 2500 ft
provide precise information for directing the movement
Maximum:
7500 ft
of aircraft in azimuth and elevation along a
Typical Hard Stand Construction for Presi-
predetermined glide path to a point above an airport
sion Trailer
runway from which a landing can be completed under
Length: 80 ft
normal visual means and under all conditions
Width: 40 ft
approaching minimum visibility.
Material: Concrete. Load rating 9000
RELATION TO SIMILAR EQUIPMENT
lbs per wheel.
None.
Search System Resolution
TECHNICAL DESCRIPTION
Azimuth Resolution: 4.0 deg
Frequency Range
Range Resolution: 1% of sweep range or
Search System (S-Band): 2775 to 2900 mc
650 ft, whichever is greater.
Precision System (X-Band): 9000 to 9180
Precision System Resolution
mc
Azimuth Resolution: 1.2 deg
Communications Systems
Range Resolution: 400 ft
HF: 2000 to 18, 100 kc (AN/ART-13 and
Elevation Resolution: 0.55 deg
AN/ARR-15).
Range Resolution: 400 ft
VHF: 100 to 156 mc (AN/ARC-1).
Type Receivers: Superheterodyne (search
UHF: 225 to 399.9 mc (AN/ARC-27).
and precision systems).
Type of Frequency Control
Intermediate Frequencies
Search System: afc (motor-driven freq
Search and Precision Systems: 30 mc
control of Search Stalo).
Receiver Output
Precisions System: No true freq control
Search and Precision Systems: plus 2v
necessary.
(video amplitude precision and search).
Peak Power Output
Antennas
Search Transmitter: 500 kw
Beam Pattern Dimensions
Precision Transmitter: 25 kw
Search Antenna: Cosecant Squared pattern to 25
Communications System
deg in elevation. Beam width is 2.2 deg in
HF: 31 to 90w (depending on freq
azimuth.
AN/ART-13).
Azimuth Antenna: Modified Beavertail pattern to
VHF: 8w (AN/ARC-1).
give 4 deg coverage in elevation. Beam width
UHF: 10w (AN/ARC-27).
is 57 minutes in azimuth.
Pulse Repetition Frequency
Elevation Antenna: Cosecant Squared pattern to 10
Search System: 1200 per sec
deg in azimuth. Beam width is 33 minutes in
Precision System: 2400 per sec
elevation.
Pulse Width
Scanning Rates
Search System: 0.8 usec
Search Antenna: 15 rpm and 30 rpm
Precision System: 0.5 usec
Azimuth and Elevation Antennas: Two looks per
Duty Cycle
sec.
Search System: 0.00096
Scanning Ranges
Precision System: 0.0012
Search Antennas: 360 deg
Magnetron Tube Currents
Azimuth Antenna: 20 deg in azimuth
Search System: 32 to 34 ma
Elevation Antenna: 7 deg in elevation.
Precision System: 10 ma
Power Requirements
Range Limits
Search Site: 12 kva (approx)
Search System: 50 naut mi
Control Tower: 10 kva (approx)
Precision System: 10 naut mi
Precision Trailer: Approx 18 kva plus 23 kva for floor
Radial Blind Speeds
heaters.
Search System: 124 knots
INSTALLATION CONSIDERATIONS
Precision System: 77 knots
Not available.
Available Glide Path Angles
AN/FPN-2B: 2
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