Telefunken / AEG - Telefunken AG, Ulm
E 127 Kw/4 - the Telefunken - "Rainbow Receiver"
überarbeitet am 16.11.2010
The E 127 Kw/4 has been produced in the mid-fifties until the mid-sixties in
different variants and has mainly been used by official agencies, for weather
reports, press communication and as monitoring and surveillance receiver.
The receiver measures 550 x 375 x 390 mm and has a weight of 44 kg, it is quite compact compared with the E-104 or the Rohde & Schwarz EK-07; anyway, the set is quite heavy when You try to lift it on the desk in Your shack, it's a irreproachable boatanchor. The receiver can be powered from 110 - 240 V mains and has a power consumption of 70 W with it's eight tubes.
In the middle of the frontpanel, You find the multi - colour semicircular
frequency dial, the band segments are colour coded: the 1,5-3,3 MHz range 1 in white,
range 2 from 3,2-7,1 MHz in yellow, range 3 from 6,9-14,1 in grey, range 4 from
13,9-22,1 MHz in green and the last range from 21,9-30,1 MHz in red.
The other controls are located in one row below the frequency dial: from the left
the bandwidth selector, the main tuning knob, the band selector with the identical
coloured marks, the RF gain control and the AF gain / volume control.
As options, the receiver E 127 can be connected to the radioteletype adaptor TgFs 127 (reception modes F1, F3), the single sideband demodulator BP 102 for SSB reception with full (A3a) or reduced carrier (A3b) and the diversity adaptor Abl 305.
The antenna signal is fed via two R.F. amplifier stages (EF85) to the first
mixer(ECH81), where the intermediate frequency of 525 kHz is generated. The i.f.
signal has to pass two crystal filter stages (EF85) with selectable i.f. bandwidth
and will be demodulated (ECH81). For CW reception, the signal of the BFO is added.
The audio signal is amplified in the audio final stage (EL84).
The Telefunken E-127 Kw/4 with it's "Rainbow dial" is a classic collector's set,
it should not be confounded with the Siemens "Rainbow" E-310.
© Martin Bösch 26.10.2008 / transl. 16.11.2010