Ringtrichter-Richtungshörer(RRH) auf Sd.Ah.104

Used to suplement visual target aquisition, the Ringtrichter-Richtungshörer(RRH) was extremely important during night raids.It often directed a single 15.0 cm. Flakscheinwerfer, whose beam was followed by other projectors.The RRH was made more or less obsolete by specialised radars, but still there were more than 4500 units in service with the Luftwaffe in 1944.
A total of 42 RRH sets were delivered to Bulgarian Royal Army between 1937 and 1943. These were both rigidly mounted(on Anhängerfahrgestell A2, export version,used also by Romania) and dismountable(carried by 2 Sd.Ah.104 trailers).
The second version is the subject of this project.