- Frequency range: 50kHz – 30MHz, depending on coils used
- Modes: AM and CW
- Built: 1943
US company National developed the legendary HRO receiver with its drawers of plug-in coils for different wavelengths, but our two HROs were built by Collier and Beale in Wellington.
They are both installed at the Vintage AM operating desk in the East operating room.