十九試空一号電波探信儀十一型 (19-shi kū-1 Gō Denpa Tanshingi 10-gata ta, Protoype 19 Ku 1 Radio Probe Model 4). The N-6 was a prototype radar to be used by the Japanese Navy with a range of 50% of the H-6. It was intended for small patrol and search planes. Research started March 1943 by Nihon Musen Co. and 20 devices were constructed. Testing started a year later in march 1944. However difficulty arose in the R.F. receiving end of the set and research was stopped somewhere in November or October 1944. No N-6’es were used in combat.

Reports of the U.S. Naval Technical Mission to Japan

Technical specifications

十九試空一号電波探信儀十一型/ Protoype 19 Ku 1 Radio Probe Model 4
Designation H-6
Object Patrol and Search
Research started March 1943
Finished Late 1944
Operational status Not yet used
Installation Small Aircraft. Observer’s Seat
Frequency 1.2 meter / 250 kHz
Power Output (Peak) 2 kw
Pulse Length 5 µs
Repetition Frequency 1000 cycles per second
Weight 60 kg (unverified)
Units build 20
Transmitter Oscillation Circuit   Modulated Oscillator  
  Oscillator Valve T-319 x2
Receiver Intermed. Freq. 10 mc
Detector 1st UN-954 2nd FM-2A05A
Local ocillator UN-955
Scope
Representation
Diameter 75 mm
Scanning Axis Logarithmic
Scale Mechanical
Antenna Type Head: Yagi Sides: Folded Doublet
Gain 16db 6.5db
Beam Angle Horiz. θƒ = 30° θƒ = 28°
Vertical θƒ = 35° θƒ = 30°
Max. Range (Max.Effective Scale) 150 km theoretical
40 km against large ships
30 km against air planes
Minimum Distance 2.5 km at 1000 m
Accuracy of Range ≃± 5%
Distance Discrimination 1.5~2 km
Accuracy of Bearing ± 3°
Angle Discrimination ≃ 60°
No. Of Operators Observer

Sources

  • Ishiguro, R., Januszewski, T., & Karnas, D. (2018). Japanese anti-submarine aircraft in the Pacific War. Sandomierz: Stratus. ISBN 978-8365281395.
  • A short survey of japanese radar Volume 1
  • A short survey of japanese radar Volume 3
  • Reports of the U.S. Naval Technical Mission to Japan, 1945-1946. Series E-02 Japanese Airborne Radar
Close Menu