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Neptun was the code name of a series of low-to-mid-VHF band airborne intercept radar devices developed by Germany in World War II and used as active targeting devices in several types of aircraft. They were usually combined with a so-called "backwards warning device", indicated by the addition of the letters "V/R" ("Vorwärts/Rückwärts",meaning Forward/Backward). Working in the metre range, Neptun was meant as a stop-gap solution until scheduled SHF-band devices became available (for instance the FuG 240/E cavity magnetron-based Berlin AI radar).〔Aders, p. 269〕 Transceiving antennas used for the ''Neptun'' on twin-engined night fighters usually used a ''Hirschgeweih'' (stag's antlers) eight-dipole array with shorter elements than the previous 90 MHz SN-2 radar had used, or as an experimental fitment, the 90°-crossed twin-element set Yagi based ''Morgenstern'' single-mast-mounted array. FuG 216: Experimental series to plan the further development Installed in Fw 190 A-6/R11 and Bf 109 G-6 〔http://www.choiquehobbies.com.ar/revista/notas/nj/nje.htm〕 The aircraft were used by NJGr 10 until March 1944, after which some machines of 6./JG 300 (Kommando Plöger) were equipped.〔Aders, S. 210〕 *Manufacturer: ''Flugfunkforschungsinstitut Oberpfaffenhofen'' (FFO, German for "airborne radio research institute" in Bavaria) *R1 version (backwards warning device) : *Frequency: 182MHz : *Power: 1.0kW : *Transmitting and reveiving antennas each consist of twin dipoles, mounted under and above the wings, respectively : * Single display device with distance readout *V version (for single engined night fighters) : *Frequency: 125MHz : *Power: 1.2kW : *Range: 500 to 3,500m : *Antennas in the form of spikes or (Fw 190) as "antlers" on right and left wings FuG 217: Installed mainly in Ju 88 G-6, only a few Bf 110 G-4, He 219 or Me 262 received the Neptun. It could be combined with the additional ''Elfe'' device to automatically measure the target distance and fire the guns at a pre-set range.〔Aders, S. 268〕 *Manufacturer: FFO *R2 version (backward warning device) *J2 version (for single-engined night fighters) *Ausführung V/R (combined night fighter and backward warning device for two-engined fighters) : *Two switchable frequencies: 158 and 187MHz : *Search angle: 120° : *Range: 400 to 4,000m : *Spike or "antler" antennas FuG 218: mass-produced *Manufacturer: Siemens / FFO *R3 version (backward warning device) *J3 version (for single-engined night-fighters) *V/R version (combined night fighter and backward warning device for two-engined fighters) : *Six switchable frequencies: 158 to 187MHz : *Search angle: 120° : *Range: 120 to 5,000m : *Weight: 50kg : *R3 and J3 with spike antennas and V/R with "antler" antennas. *G/R version (combined night fighter and backward warning device for two-engined fighters) : *Only one single device built, replacing the 2kW transmitter with a 30kW transmitter. Range increased to up to 10km. This device was intended for the Dornier Do 335. "Antler" antennas. == Literature == *(1) TME 11-219 Directory of German Radar Equipment *Gebhard Aders: ''Geschichte der Deutschen Nachtjagd'', Motorbuch publishing corporation, 1977, ISBN 3-87943-509-X * File:Neptun FuG 217.pdf 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Neptun (radar)」の詳細全文を読む スポンサード リンク
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