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ETM-1800
HF radio modem with FEC - this page is a stub

ETM-1800 was a high-end HF radio modem with error-correcting features like Forward Error Correction (FEC) and echo-cancelling, developed in the early 1980s by Telefunken 1 in Ulm (Germany). The device was mainly intended for use by the German Armed Forces and by NATO.

The device is housed in a 4U 19" rackmount enclosure, as shown in the image on the right. It has several controls for setting the baudrate and selecting the desired transmission protocol, plus a LED-bar that shows the signal quality. Several LEDs are available to show the current status.   

The layout of the front panel is in the same style as that of the E-1800 receiver, which was part of the same family of devices. In the FARCOS communications system, they were mounted in the same 19" rack. The ETM-1800 was succeeded in 1984 by the 1U high ETM-1810 and ETM-1820.

Front panel of the ETM-1800 [1] Jim Meyer with a double FARCOS installation in the former Telefunken Museum in Ulm in 2015 [1]
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Front panel of the ETM-1800 [1]
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Jim Meyer with a double FARCOS installation in the former Telefunken Museum in Ulm in 2015 [1]

References
  1. Helmut 'Jim' Meyer, HS0ZHK, My way to Ham - Radio and beyond
    Website QRZ.COM. Personal correspondence. March 2018.
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Crypto Museum. Created: Monday 26 March 2018. Last changed: Monday, 26 March 2018 - 14:52 CET.
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