Shortwave Receiver E311b
Siemens sold the device from 1962. The E311 is a triple superheterodyne receiver and covers the spectrum from 1.5 to 30 MHz in five sub-bands. Coarse tuning, using the first oscillator (a crystal-synchronized grid oscillator), allows for capturing every 100 kHz step within the received spectrum. The fine tuning is linked to the counter and allows continuous adjustment of the detented frequency by up to 100 kHz, thus enabling any frequency between two 100 kHz steps. The 100 kHz crystal and the interpolator are housed in the thermostat. The E311 uses only three tube types: three EF93s, five ECH81s, and eight E88CCs, all housed in the 25 kg unit.
