Dahme 2 →
Opto-electronic voice transceiver
- wanted item
Dahme 1 1 was a transistorised semi-portable
opto-electronic device for speech communication
through infrared light (German: Lichtsprechgerät),
developed in the early 1960s by the Operativ Technischer Sektor
of the repressive intelligence service of the former DDR (East-Germany) —
Ministerium für Staatssicherheit (MfS), also known as the Stasi.
It was a three-piece unit that was designed to work in combination with
a portable Dahme 2 device at the opposite side.
The device consists of three units:
a base section, an optical section and an amplifier.
The image on the right shows the optical section installed
on the bottom section and mounted on a tripod. The battery-powered
amplifier was fitted in an external grey box.
It allowed two-way voice communication, using a miniature
Sennheiser MM-23 microphone and an earpiece.
The device was intended as a base station, using a
Dahme 2 device at the opposite end.
In 1964, a Stasi agent was arrested in West-Berlin, with a
Dahme 2 device in his possession.
He had used it to contact a Stasi station in
East-Berlin, located in a
house just across the Teltow channel.
The Dahme 2 device was smaller and was fitted (partly) inside a photo camera.
It is believed both devices (Dahme 1 and Dahme 2) were inspired on
the American XE-2 device that had been confiscated
by the Stasi in 1959, when Western (CIA) agent Gisela Gebhardt
As far as we know, there are no surviving sample of a Dahme 1.
➤ More about Dahme 2
The Dahme is a river that flows in the German states of Brandenburg
and Berlin. The Stasi commonly used river names for its infra-red
(IR) communication devices. As Dahme is pronounced the same as the
German word Dame (lady), the name was easily transformed into Dame 1
DeviceLine-of-sight (LOS) light-based communication device (Lichtsprechgerät)
PurposeCovert cross-border agent communication
PurposeSpeech, recorded audio
UsageIndoor (limited outdoor usage)
Bandwidth400-2500 Hz ±6dB
RangeAgainst Dahme 1: 3 km (at 4 km visibility)
Against Dahme 2: 2 km (at 2 km visibility)
PowerReceiver: 2 x 3V
- Transmitter: 5 x 1.5V
External5 to 8V DC
DimensionsUpper part: 215 x 115 x 38 mm
Lower part: 205 x 105 x 35 mm
Amplifier: 160 x 115 x 30 mm
Full name: Bundesbeauftragte für die Unterlagen des Staatssicherheitsdienstes
der ehemaligen Deutschen Demokratischen Republik
Federal Commissioner for the Records of the
State Security Service
of the former German Democratic Republic (GDR) —
officially abbreviated to BStU.
Document obtained from BStU  and kindly supplied
by Detlev Vreisleben .
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© Crypto Museum. Created: Thursday 09 December 2021. Last changed: Tuesday, 14 March 2023 - 09:47 CET.