German Radio Equipment: The Equipment used in the Junkers Ju 88 and Do 217

Abstract

III.—TYPE FuG 16 Summary THE equipment consists of a communication transmitter and receiver operating on a frequency spectrum from 42.2 Mc/s to MS. 39c/s. Telephony is used. The pilot's intercommunication control box bears the designation “B.Z.B.” which is taken to be the abbreviation for “Bord zu Bord” (“Aircraft to Aircraft”). The transmitter, receiver and motor generator are located inside the fuselage on the starboard wall just aft of the D.F. receiver. The tuning controls are not accessible in flight. There is no provision for the fitting of remote tuning controls. The equipment must, therefore, be used on one channel only, pre‐set on the ground. The tuning dials of both transmitter and receiver are fitted with a “click” stop mechanism for tuning to four pre‐determined frequencies. This indicates that the equipment is also used, or may be used, in an installation which is fully accessible to the operator. The tuning dials of both transmitter and receiver have the frequency of 392 megacycles specially engraved in red. The other calibrations are in black. The pilot controls the operation of the equipment. A control lead is provided at the navigator's position, but is turned back and taped off. The wireless operator's panel carries switches “Heaters on” and “Motor Generator on” only. The installation is carried out in a permanent fashion and is well planned. There is no indication that it was introduced as an afterthought. The construction of the apparatus follows the usual German technique. In this case, however, the transmitter, receiver and associated circuits are in a single unit. Previous German apparatus has been built with transmitter and receiver in separate units. The ganged variable condensers in both transmitter and receiver are much smaller than those used in other German apparatus. The attendant economy in space probably permits the increased compactness of the unit described.

Citation

(1942), "German Radio Equipment: The Equipment used in the Junkers Ju 88 and Do 217", Aircraft Engineering and Aerospace Technology, Vol. 14 No. 8, pp. 230-234. https://doi.org/10.1108/eb030932