Cubic R3030 dual HF (5 kHz. . . 30 MHz) receiver - badged as a Malborough Communications Limited (Ltd) MCR 3030B used by the RAF. This is a great example of the very rare Cubic R3030 Two very high performance dual conversion HF receivers in one case, each receiver has it s own set of controls, audio, antenna etc. modes: AM, FM, CW, LSB, USB bandwidth : 0. 5, 1, 2, 4, 8 kHz (AM, CW, FM) : 2 kHz (LSB/ USB) IF shift +/ - 9. 99 kHz BFO +/ - 9. 99 kHz meter - signal strength or audio or frequency tune. ...