The R-808, is an extremely rugged receiver of the same vintage as the R-392.  Made by Federal (and perhaps others), it runs on 120V AC or 28V DC, has built in TTY convertor, and uses harmonically related bands to tune from 2 to 32 MHz. 

Like the R-392, it is heavy, green, and will survive direct hits from anything short of armor-piercing rounds.  The power and audio connectors look very similar to those on the R-392.