00:Home

10:Aircrafts

20:Carriers

30:Bases

40:Maps

50:R.O.E.

60:Crews

70:More

80:Story

90:Missions

11:Weapons

12:Armament

13:Targets

.

RADARS


 

Article

 

 
     
     
  US NIGHT FIGHTER RADARS OF WWII  -  AN/APS-6  
  Extract from a compilation prepared by Thomas Wildenberg for HyperWar
Copied from : http://www.ibiblio.org/hyperwar/USN/ref/NightFighterRadars/index.html
 
     
     
  See also : Reference Documents
 US Radars - 1943
 US Radars - WWII
Other AAC pages
 AN/APS-6
 AN/APS-20
 
     
     
 

AN/APS-6 3 cm Radar

Lightweight search and intercept radar for installation in F4F, F6F (right) and F7F fighters.

 

Wavelength and Function
3 cm search and interception radar for carrier based aircraft. Provides beacon function and has connections for IFF

Provides indication for firing guns. Improved upon AIA with modulator in nacelle close to scanner

Research and Development by Radiation Laboratory and Westinghouse Electric and Mfg. Co., Inc.

Operational Requirements :
Weight: 242 lb. less cables  -  Operator : 1  -  Power Supply :
29 amp, 27 v DC, and 780 w, 115V. 1 ph, 800 to 2400 cps

-
Performance
Max. Ranges Bombers 10,000 yd.
Fighters   8,000 yd.
Battleships 61,575 yd.
Min. Range 120 yd.
Range accuracy (search mode) ▒10░ +2░ full scale
Range accuracy (aiming) 25yd at firing point of 250yd
Angular Accuracy (search mode) ▒3░ Azimuth and Elevation
Angular Accuracy (aiming) ▒0.5░ Azimuth and Elevation
Search range scale to 4 miles Conical scan accurate aiming to 1000 yd.
-

Search
Spiral scan through ▒60░ at 1200 rpm (120░ cone along forward axis of aircraft). Search ranges of 1, 5, 25, and 65 nautical miles. 1000 yd range for close approach and gun aiming. Beacon ranges: 1, 5, 25, and 100 nautical miles.

Target Following
Fixed guns are aimed by pointing plane.

Antenna specifications
Dipole in rotating and nodding 17-inch paraboloid.  Half power beam width: 5░ in azimuth and elevation.  Gain: 1100.

Transmitter       Receiver      
Frequency 10,000 mc/s Pulse Rate 2000 pps Type superheterodyne IF Band Pase 2.7 mc/s
RF.Source magnetron Pulse R/beacon 0500 pps States O-RF; 7-IF Mixer IN23 crystal
RF.Lines waveguide Pulse Length 0.5 Ás Local oscillator 723A/B Noise, db above kt df 16
Pulser Type had tube Pulse L/beacon 2.0Ás Intermed.Freq 60 mc/s AFC optional  
RF peak power 40 kw Energy pp 0.02 joules Sep oscillator for beacon AVC aiming only
RF avrg power 0.04 kw            

Indication and Data Output
3-inch indicator CRT: B scan on search and beacon ranges with type O scan on 1 and 5 mile search range. Type G scan for aiming.

Remarks
AN/APS- 6 uses Westinghouse RF head with radar and beacon AFC. AN/APS-6A uses Philco RF head and has no beacon AFC.

Procurement and Production
Manufacturer Westinghouse Electric
Number ordered 3129
Procuring Service US Navy
Number delivered 2161 as 1945.01.08
Unit cost US$        10,938
Delivered units US$ 23, 632,696
AN/APS- 6 Pilot's Manual
(pdf file)
 
___________