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Opto Voice Stasi Dahme 2 → ← XE-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
(OTS)
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.
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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.
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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
was arrested.
As far as we know, there are no surviving sample of a Dahme 1.
➤ More about Dahme 2
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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
(lady 1).
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Device Line-of-sight (LOS) light-based communication device (Lichtsprechgerät) Purpose Covert cross-border agent communication User MfS (Stasi) Manufacturer OTS Frequency Infrared Purpose Speech, recorded audio Usage Indoor (limited outdoor usage) Angle (2ω) 0.5° Bandwidth 400-2500 Hz ±6dB Range Against Dahme 1: 3 km (at 4 km visibility)
Against Dahme 2: 2 km (at 2 km visibility) Microphone Sennheiser MM-23 Power Receiver: 2 x 3V - Transmitter: 5 x 1.5V
External 5 to 8V DC Lamp 100 hours Dimensions Upper part: 215 x 115 x 38 mm
Lower part: 205 x 105 x 35 mm
Amplifier: 160 x 115 x 30 mm
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Full name: Bundesbeauftragte für die Unterlagen des Staatssicherheitsdienstes
der ehemaligen Deutschen Demokratischen Republik
(DDR) —
Federal Commissioner for the Records of the
State Security Service
of the former German Democratic Republic (GDR) —
officially abbreviated to BStU.
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Document obtained from BStU [2] and kindly supplied
by Detlev Vreisleben [1].
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© Crypto Museum. Created: Thursday 09 December 2021. Last changed: Tuesday, 14 March 2023 - 09:47 CET.
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