The wireless operator's station, in the aft fuselage, was fitted with the AR350 / AR5 ( the standard for Italian bombers ), a radiogoniometer ( P63N ), an OMI AGR . 90 photographic-planimetric machine or the similar AGR 61.
22.
They were able to quickly duplicate their efforts once reaching the US . This system used a motor to quickly spin a radiogoniometer, as well as providing an input to electronics that spun the X and Y inputs of a cathode ray tube ( CRT ).
23.
The result was that the upper trace contained the original range signal as before, while the lower trace contained the radiogoniometer output; by looking along the lower trace under the range blip, the operator could turn the radiogoniometer until the signal reached a null, revealing the angle.
24.
The result was that the upper trace contained the original range signal as before, while the lower trace contained the radiogoniometer output; by looking along the lower trace under the range blip, the operator could turn the radiogoniometer until the signal reached a null, revealing the angle.
