As a descendant of WWII receivers like Lorenz "Schwabenland" or Telefunken H.E."Caesar" (coil turret, IF filters) this receiver became necessary when West Germany was reintegrated into the world market in the late forties. It was used by different government authorities and on ships. Some of these receivers were exported to Belgium and France. Competitors were Hagenuk UE 11, Lorenz E 5 and Telefunken E 127 Kw. The shape of the selectivity curve doesn’t fit today's needs.
The E 301 is the first version (1952). The E 303, E 305 and E 306 (1953) are about the same with different power supplies covering 1.5 MHz – 30.2 MHz in seven ranges. The eighth compartment of the coil turret is not in use normally. An additional frequency range of 230 – 530 kHz and a vibrator for 24/110 V DC were available as an option.
There is also a model E 307. The precise differences to the E 303 are unknown; the faceplate looks about the same. The E 307 however has different frequency ranges: 1.5 – 3.0 / 3.1 – 4.6 / 6.2 – 6.5 / 8.1 – 8.8 / 12.2 – 13.3 / 16.2 – 17.4 / 22.0 – 22.7
Note that the E 302 is a relabelled former E 66a (1948) for marine applications. It is electrically and mechanically quite different and has a long linear dial.
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