Addtional Notes on Radars


Radar Part of Range1
Range2 Range3
APQ120         The AN/APQ-120 was an aircraft fire control radar (FCR) manufactured for the McDonnell Douglas F-4E Phantom II and it was manufactured by Westinghouse. AN/APQ-120 has a long line of lineage, with its origin traced all the way back to Aero-13 FCR developed by the same company in the early 1950s. A total of half a dozen FCRs were tested and evaluated on the first 18 F-4s built, but they were soon replaced by later radars produced in great numbers, including AN/APQ-120.
  Aero.13       Aero 13 FCR designed for Douglas F4D Skyray is origin of AN/APQ-120, and it established the configuration of the airborne FCR not only for the radar families of AN/APQ-120, but also a standard for all other airborne radars to follow: Aero 13 FCR was designed as an integrated cylindrical module that could be plugged into the nose of an aircraft, instead of a set of semi-independent black boxes
  Aero.1A       Aero 13 did not have any capability for semi-active radar homing (SARH) air-to-air missile (AAM)s. 1A FCR was developed to add this capability by incorporating a continuous wave illuminator for SARH AAMs. This configuration of Aero 1A remained unchanged for later radars for F-4s all the way until AN/APQ-50.
APS-21 APQ-35 20.nm     The next radar to be installed on F-4 prototypes and pre-production series was the AN/APQ-35, actually made of two radars: the AN/APS-21 search radar that could locate fighter-size targets at a range of 32 kilometers (20 miles), and the AN/APS-26 targeting radar, with a range of 3.2 kilometers (2 miles)
APS-26 APQ-35 2.nm    
  APQ-36       AN/APQ-36 is the improvement over earlier AN/APQ-35, and when AN/APQ-36 entered service on Douglas F3D Skyknight and Vought F7U Cutlass, it was the largest airborne FCR of its time. The more powerful AN/APQ-36 with large size did not have any problem being installed on F-4 prototypes, so that more powerful FCR of larger size would be developed.
  APQ-41 24.nm   100.nm The AN/APQ-41 is the improvement over AN/APQ-36, and it is designed to provide air intercept, search, to automatically track a selected target, and to supply lead angle and range information. Facilities are also provided for air-to-surface search, for beacon interrogation and response display, and for response display when used in connection with identification friend or foe (IFF). 
  APQ-46       AN/APQ-46 is the last radar tested and evaluated on F-4 prototypes and pre-production series. F-4 equipped with this radar was specifically modified to meet US Navy Ferret electronic countermeasure aircraft requirement, which eventually did not materialize.
  APQ-50       AN/APQ-50 is the radar installed on low-rate initial production batch of F-4s, but as with earlier radars, it was not used in great numbers in comparison to later radars of the same family. The parabolic antenna is 24 inches in diameter, and in addition to providing all weather capability, AN/APQ-50 FCR also provides information on automatic firing of rockets.
  APQ-72       AN/APQ-72 FCR is a development of AN/APQ-50, with diameter of the antenna increased by a third to 32 inches from the original 24 inches of AN/APQ-50. AN/APA-128 CW illuminator is integrated with the radar to give it a capability for radar guided AAMs. AN/APQ-72 is the first radar installed on F-4s to be built in great numbers, starting with the 19th F-4 produced.
APG-59 AWG-10       AN/APG-59 FCR is a modified AN/APQ-72 designed for the British. The main difference between AN/APG-59 and its predecessor AN/APG-72 is that AN/APG-59 had a radar dish which could be swung sideways in order to reduce the length of the aircraft to 54 feet so that it could fit on the small deck lifts of British carriers. Used in the AN/AWG-10.
APQ-100         AN/APQ-100 is the replacement for the AN/APQ-72, and it featured a redesigned radar scope in the rear cockpit that offered a plan position indicator (PPI) mapping display option, and adjustable range strobe for bombing. For air-to-ground missions, the radar interfaced with the inertial platform on F-4s.
APG-60 AWG-11       Modified AN/APQ-100 for the British to replace the AN/APG-59. As with AN/APG-59, AN/APG-60 also had a radar dish which could be swung sideways in order to reduce the length of the aircraft to 54 feet so that it could fit on the small deck lifts of British carriers. AN/APG-60 was later upgraded with Doppler capability during its upgrades, and integrated in the AN/AWG-11.
APQ-109         AN/APQ-109 is an improvement of the earlier AN/APQ-100 with an improved cockpit display able to handle TV imagery from weapons such as AGM-62 Walleye. Other significant additions included air-to-ground ranging, ground beacon identification and display capabilities. AN/APQ-109 was an improved, more reliable "hybrid" version of the AN/APQ-100 with solid-state components in the low-voltage sections.
APG-61 AWG-12       Modified AN/APQ-109 for the British to replace AN/APG-60. As with AN/APG-59/60, AN/APG-61 also had a radar dish which could be swung sideways in order to reduce the length of the aircraft to 54 feet so that it could fit on the small deck lifts of British carriers. Used in the AN/AWG-12
APQ-117 AWG-14       AN/APQ-117 terrain following and attack radar, developed from earlier AN/APQ-109, with terrain following capability added.   A fully solid-state radar developed from AN/APQ-117, the AN/APQ-120 radar was much more compact than its predecessors, allowing it to fit into the nose along with the cannon, and the radar was later integrated into AN/AWG-14
  AWG-10       AN/AWG is defined by the Joint Electronics Type Designation System (JETDS) and stands for (A/N) Army/Navy (A) Piloted Aircraft (W) Armament (G) Fire Control. AN/APG-59 was the first FCR integrated into AN/AWG-10, which developed into two more versions, A and B. The original AN/AWG-10 can detect an aerial target with 5 square meters radar cross section more than 100 kilometers away
  AWG-10A       AN/AWG-10A is a development of the original AN/AWG-10, with great improvement in reliability and maintainability by replacing the original transmitter in AN/AWG-10 by a solid state unit whose only tube was a klystron power amplifier. Adding a digital computer allowed much more effective missile launch equations. AN/AWG-10A also incorporated a new servoed optical sight. There were also additions of new modes such as continuously displayed impact point mode, freeze displayed impact mode, and computer released visual mode. AN/AWG-10B was further digitized version of AN/AWG-10/10A but retained many analog circuits. A key AVC (avionics change) was the replacemnet of the unreliable Doppler Spectrum Analyzer (DSA) with a reliable Digital Spectrum Processor (DSP) which also increased accurracy when operating in doppler mode.
  AWG-11       AN/AWG-11 was a British AN/AWG-10 license-built by Ferranti. The radar used was AN/APG-60, and AN/AWG-11 is a slightly modified AN/AWG-10 in that it's compatible with AGM-12 Bullpup and WE.177, so that British F-4s can perform nuclear strike missions if needed to.
  AWG-12       AN/AWG-12 was an improved AN/AWG-11 built by Ferranti with AN/APG-61 FCR. The main difference between AN/AWG-11 and AN/AWG-12 is that the latter has better ground mapping mode, and it also can control a belly mounted SUU-23/A Vulcan. AN/AWG-12 finally retired in 1992 when the last F-4s in British service retired, and during its service life, it was upgraded with improvements of the AN/AWG-10A/B.
  AWG-14       AN/AWG-14 is the final member of the lineage of this radar family, and it is a fully digitized upgade of the AWG series incorporating AN/APQ-120. The open architecture and modular design enable AWG-14 to accommodate different radars, such as AN/APG-65, AN/APG-66, AN/APG-76, Elta EL/M-2011/2021 and EL/M-2032.
APG-32   12.nm     Manufacturer: General Electric
Power: 40 kW
Search Range: 24,000 yards (11.85 nm)
Tracking Range: 8,000 yards (3.95 nm)
Type of Radar: Tail Gun Radar
IEEE Band: X Band (9245 MHz)
NATO Band: I Band
NOTES: Used on B-47E Aircraft as tail gun control radar.
  Radar Horizons Range Target Alitutde
AWACS 20,000 ft above SL 179~ nm
260~ nm
368~ nm
449~ nm
563~ nm
878~ nm
50 ft
5,000 ft
25,000 ft
50,000 ft
100,000 ft
328,000 ft
Typical Radar Cross Sections (RCS) for X-band radars RCS
F4H Phantom - 6 m▓ - - 8 dBsM   -
T33 Silver.Star - 10 m▓ 100 m▓ 10 m▓ 10 dBsM 20 dBsM 10 dBsM
Tank   - 10 m▓ - - 10 dBsM - -
Truck   - 10 m▓ - - 10 dBsM - -
B70A Valkyrie - 40 m▓ 100 m▓ 600 m▓ 16 dBsM 50 dBsM 27 dBsM
B52 Stratofortress - 100 m▓ - - 20 dBsM - -
Radar Part of Range1
Range2 Range3
GPN-2       26 nmi
30 mi  
48 km 
Manufacturer: Bendix
Type of Radar: Mobile Ground Radar Search System
IEEE Band: S Band
NATO Band: E Band
Exact Frequency: 2869 ľ 2900 MHz
Pulse Repetition Rate/Frequency (PRR/PRF): 2,000 pps
Pulse Width(in Áseconds): 0.5 Áseconds
Peak Power: 200 kilowatts
Maximum Instrumented Range: 30 miles
GPN-6       57 nmi
60 mi  
96 km 
Manufacturer: Laboratory for Electronics Inc.
Type of Radar: Mobile Search Radar
IEEE Band: S Band
NATO Band: E Band
Exact Frequency: 2700 ľ 2900 MHz
Pulse Repetition Rate/Frequency (PRR/PRF): 1000 pps
Pulse Width (in Áseconds): 0.9 Áseconds
Peak Power: 500 kilowatts
Maximum Instrumented Range: Approximately 60 miles
: Equipment is mounted in two trailers and a 1-ton truck.
AN/SPS Band Surface Vessels Application Detection Example
AN/SPS-2 L Long range Height Finding Search Target Detection Example 1: Heavy Bomber at High Altitude at 300 nm
Target Detection Example 2: 1m▓ Target at 165 nm
Notes: Only two built: CC-1 USS Northampton and CLG-4 USS Little Rock
AN/SPS-4 C Surface/Zenith Search Radar Detection Example 1: Destroyer at 20 nautical miles
Detection Example 2: Battleship at 23 nautical miles
Detection Example 3: Fighter at 20 nautical miles
Notes: First deliveries made August 1952
AN/SPY     Radar Horizon Range Target altitude
AN/SPY-1   USS Ticonderoga CG 50 ft above SL 17. nm
95. nm
200. nm
283. nm
397. nm
713. nm
50 ft
5,000 ft
25,000 ft
50,000 ft
100,000 ft
328,000 ft
AN/BPS Band Application Detection Example
AN/BPS-1 X Submarine Attack Radar
Detection Example :   12 nautical miles : destroyer
Maximum altitude : SS-1. 1st attack radar @ periscope depth
AN/BPS-2 L Submarine Air Search Radar
Detection Example :   70 nautical miles : bomber
Maximum altitude :   70,000ft
AN/BPS-3 S Submarine Height-Finder
Detection Example :   40 nautical miles : 20m▓ target
Maximum range : 131 nautical mies
AN/BPS-4 S Submarine Air Search Radar
Detection Example :   15 nautical miles : bomber
AN/BPS-5 X Submarine Surface Search Radar
Detection Example :   12 nautical miles : destroyer
Maximum range :   79 nautical miles
AN/BPS-11 X Submarine Surface Search Radar
Maximum range :   79 nautical miles
AN/BPS-12 X Submarine Navigational Radar
Maximum range :   39 nautical miles
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