überarbeitet am 23.10.2010
"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.
single conversion, 250 - 525 kHz, 1,5 -30 MHz, AM, SSB (BFO)
double conversion, 14 kHz - 30,2 MHz, AM, SSB (BFO), 0,6 / 1,6 / 2 / 6 KHz
triple conversion, 1,5 - 30,1 MHz, AM, SSB, 0,3 / 1 / 3 / 6 kHz
triple conversion, 70 kHz - 30 MHz, AM, SSB, 0,3 / 1 / 1,5 / 3 / 6 kHz