Siemens & Halske Shortwave Receivers

"Siemens Telegraph Society" has been active in various segments of electricity and telecommunications in the end of the nineteenth century; in the early years of wireless communications, Siemens Halske produced receiving and transmitting equipment and radio valves. Production stoppend when the Berlin and Arnstadt plants have been destroyed during wartime.
After WWII, Siemens got back to shortwave receiver production and made very powerful receivers for maritime communications. The early E309a has been followed by the E 310a in 1961: this heavy-weight marine receiver with it's multicoloured dials activated by identically coloured pushbuttons has been well known as "Rainbow Receiver". This set offered an accuracy of better then 1 kHz using a crystal calibrator and a 100 kHz "magnifier glass dial".
In parallel, after 1959 Siemens sold the E 311, a triple conversion receiver with a mechanical digital display and a fine tuning dial allowing a frequency readout accuracy better then 100 Hz. This receiver offered ful SSB reception and had only half as much weight as the EK 07 of Siemens' rival Rohde & Schwarz.

Later receivers were the E401 / 403 with the nixie tube digital frequency display and the solid state marine receiver E410 with BCD switch frequency entry and mechanical digital frequency display.

In the eighties and nineties, small travel shortwave radios made by Sangean have been marketed under Siemens label, in the meanwhile Siemens completely withdraw from consumer electronics.

E 309: single conversion, 250 - 525 kHz, 1,5 -30 MHz, AM, SSB (BFO)
E 310: double conversion, 14 kHz - 30,2 MHz, AM, SSB (BFO), 0,6 / 1,6 / 2 / 6 KHz
E 311: triple conversion, 1,5 - 30,1 MHz, AM, SSB, 0,3 / 1 / 3 / 6 kHz
E 410: triple conversion, 70 kHz - 30 MHz, AM, SSB, 0,3 / 1 / 1,5 / 3 / 6 kHz