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Crypto Data Telefunken TST-4045 → ← ETM-1810/M
ECHOTEL modem for HF radio
- this page is a stub
ETM-1820/M is a high-end HF radio modem with error-correcting features like
Forward Error Correction (FEC) and echo-cancelling,
developed around 2002 by AEG Telefunken 1
in Ulm (Germany) as the successor to the ETM-1810/M.
The device is part of the ECHOTEL family and was used
by the German Army and by NATO. It is backward compatible
with ETM-1810/M.
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The device supports multiple waveforms
and allows additional modes to be added later by updating the firmware
or by soft-loading them.
The ETM-1820/M was commonly used in the fully adaptive
(modified) STANAG 4285 mode with QPSK
in the upper sideband and suppressed carrier (J2D). Data transmissions
generally took place in 3.2 sec frames at a speed of 2400 baud.
When present, the LCD display at the front panel continuously shows the
quality of the signal.
The device can also be remote controlled, e.g. by the ARCOTEL ACT-1810
transmission processor.
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It is currently unclear what the difference is between the ETM-1820/M
and its predecessor, the ETM-1810/M. The
interior of the ETM-1820/M appears to be identical to the interior of the
ETM-1810/M-A — the version with the additional
DSP board and extra waveforms.
It is therefore likely that the device
is 'just' an ETM-1810/M-A with improved software.
The rest is marketing.
ECHOTEL modems were used in FARCOS and MAHRS systems, and were
integrated in the HF-7000 special forces radio system.
During the Cold War, ECHOTEL
modems were also used as part of the base station of the pan-European
stay-behing radio system HARPOON.
The ETM-1820/M is compatible with its predecessors
ETM-1810/M and ETM-1810,
but features additional waveforms.
ETM-1820/M was also used as the basis for the
TST-4045 HF Modem
made by Timmann.
➤ Control protocol
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Due to name changes, the ETM-1810 was also sold under the names
Telefunken System Technik (TST), DASA, EADS, Racoms, EADS Racoms,
and Telefunken Racoms.
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- Serial single-tone ➤ waveforms
- High data rates up to 19,200 bps
- Decision feedback equalizer
- Efficient forward error correction (FEC)
- Short acquisition at start of transmission
- Very robust ➤ transmission modes
- Suitable for STANAG 5066 systems
- Suitable for duplex, half-duplex or simplex HF radio connections
- Suitable for short signal transmission (e.g. DF commanding)
- Suitable for continuous or long-term transmissions (broadcast, fax, text, etc.)
- Suitable for transmission of digitized, coded voice
- Built-in Test-Equipment (BITE)
- Data interface operable in synchronous and asynchronous mode
- Modem setting via front panel
- Remote control via serial-line or Ethernet
- Mains or battery power supply (option)
- Stationary or mobile applications
- 19" 1U rackmount module
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- MIL-STD-188-110A/B
- MIL-STD-188-110B Appendix F (ISB)
- STANAG 4539 Annex B, inclusive Autobaud
- STANAG 4415 75 bps (NATO robust waveform)
- STANAG 4481 FSK
- STANAG 4285, including Annex E
- STANAG 4529 (Narrow-Band)
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- STANAG 4538
- STANAG 4539
- STANAG 4285
- STANAG 4529
- MIL-STD-188-110B including Appendex F (ISB)
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Data EIA RS-232C, DIN 66020, CCITT V.24.V.28 Control EIA RS-232C, DIN 66020, CCITT V.24.V.28 (internal connector) Speed 75, 150, 300, 600, 1200, 2400, 4800, 9600, 19200 baud asynchonous
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The following equipment is known to be compatible with ECHOTEL:
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Web page no longer available (2024).
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Any links shown in red are currently unavailable.
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© Crypto Museum. Created: Tuesday 20 March 2018. Last changed: Thursday, 08 May 2025 - 10:58 CET.
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