This is from 1948 too, and from the same company:
https://ww2aircraft.net/forum/thread...am-1948.58452/
Most online articles talk about the development (by Hughes' company) of radar for fire control purposes around these years, but the technology obviously had several offshoots. By this time radar installations had shrunk to managable sizes for incorporation into regular airliners, but it still would have entailed a weight/space/drag penalty in some way.