The Navy RBG-2 was also identified as the CHC-46140 receiver, a general coverage HF, 11 tube superheterodyne that covered 543kc to 31Mc. It is the Navy ruggerized version of Hammarlund's civil receivers HQ-120x and HQ-129x. The band spread dial is calibrated for the maritime HF communications bands. It allows for voice and CW reception. It was usually mounted in the US Navy vessels radio rooms during WWII.
Produced under contract 87147, 14 June 1941 for the WWII effort. It was a variation of the Hammarlund HQ-120 built under US Navy specifications.
Its lightweight of "only" 68 pounds was remarkable at a time when many other similar receivers could easily weight 80-100 pounds.
The RBG-2 receiver was used as a general-purpose receiver working well to receive voice (AM) as well as Morse code (CW). It covered 543 KC - 31 MC in six bands. It could be tuned with a calibrated dial. It was used on-board all types US Navy vessels during World War II, frequently located in the radio room.