The HRO-MX National radio was the most famous model of the American National Company for ground-based aviation radio centers.
This is the WWII version of the HRO dubbed the HRO-MX. This version still has the large six pin glass tubes but many improvements were already incorporated by the time D-706 was built, probably around late 1944 to early 1945. Note that the serial number uses the “D” prefix which was also assigned to the first HRO production run in 1935, however the number at “706” is much higher than the numbers assigned in the initial “D” run. Also, note that this receiver has the Marion Electric 0-1mA S-meter that was installed on some of the WWII production HROs.
It was produced since 1942. The HRO-MX National radio receiver covered the entire short wavelength range of 50 KHz … 30 MHz and was suitable for receiving AM, CW, SSB signals.
Broadcast, Long Wave and more than two Short Wave bands.
| Coverage: 50 kHz – 30 MHz (9 ganged coil sets 50-100 / 100-200 / 180-430 / 480-960 / 900-2050 kHz / 1,7-4 / 3,5-7,3 / 7-14,4 / 14-30 MHz, no bandspread in these coils available). |
