Models
Main HRO models:
- HRO (also called HRO-Sr, 1935–1943)
- HRO-Jr (February 1936-1943, US$100 version of Sr with only one coil not individually aligned to the receiver and lacking crystal filter, phasing control, and signal strength meter)
- RAS (1939-?, HRO-Jr for US Navy with general coverage coils and 175 kHz IF so the radio could receive the 500 kHz distress frequency)
- HRO-M (used in conjunction with Bletchley Park)
- HRO-5 (1944–1945, octal tube version).
There were also several sub-variations on these models.
Read more about this topic: National HRO
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