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TCD Ecolex IV Ecolex X
The TH-4179 was commonly used in combination with the
TH-3676 FSK modem, also developed by telefunken.
It is a passive device, in that it does not require a power source.
It connects to the TH-3676 via two or four wires, and
also provides the push-to-talk (PTT) function, allowing the
Ecolex X to select between TX and RX.
The device is inserted between the RT-3600 radio and
its handset. A fixed cable is present for connection to the handset socket
of the RT-3600 radio, whilst the handset is connected
to the U-229 receptacle at the front panel.
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The TH-4179 is typically required in case (encrypted) telegraphy has to be
sent over half-duplex two-way radio systems. In such systems, the user normally
presses the push-to-talk switch (PTT) on the handset, to switch over
from reception to transmission.
The TH-4179 allows an external encryption device to take over this function.
In addition, a switch at the
front panel of the TH-4179
allows selection between the handset (TFN) and telegraphy (encryption)
equipment (TGF).
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The diagram below shows a typical setup with the TH-4179 (here shown in blue).
The fixed cable of the TH-4179
(stowed behind a hinged panel)
should be connected to the radio set (instead of the handset), whilst the
handset is connected to the U-229 receptacle at the centre of the front panel.
The four black banana sockets at the left of the front panel, should be
connected (one-on-one) to the four black banana sockets at the right of the
front panel of the TH-3676 FSK modem.
The telegraphy equipment — for example a
Siemens T-100 teleprinter —
is connected to the TH-3676 FSK modem.
When a telex encryptor such as the Philips Ecolex X
is present, it is connected in between the teleprinter (T-100)
and the TH-3676 modem. It takes over the PTT function.
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© Crypto Museum. Created: Tuesday 31 December 2024. Last changed: Thursday, 24 July 2025 - 08:14 CET.
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