The Tubular Head is a cylindrical hollow tin piece with a hood. It is suitable for containing Ronja 10M Reciver or Ronja 10M Metropolis Transmitter. It's optics is a loupe lens. The lens is heated. Mechanical interface is holder heel, which is configurable (three positions are available, in the front, middle and rear of the tube).
For electircal interface, 8-terminal wire nut is prepared inside the tube and four soft grommets suitable for sealing the cables are pepared. The optical head is prepared (if correctly installed) to withstand long-term effects of rain, moisture, dew, fog, snow, and sun without an interrruption of network service.