This signal has been heard several times, this one on 12282.5 KHz on USB at 1430z. An old WUN publication (http://www.udxf.nl/WUN-v10.pdf) and some other logs report the 12282.0 and 12282.4 frequencies as operated by German Military, so probably the 12282.5 frequency is also owned by that same network.
MAHRS-2400 is a STANAG4285-like 2400Bd PSK-8 serial waveform (Pic. 1), although in this record (due to an unrelated signal) the carrier seems to be ~68 Hz lower than the usual 1800 Hz. Unlike STANAG 4285, this signal has a 106.6ms ACF and 2 x 8-tones preamble structure (Pic.2). Both the preamble and modulation technique of this signal are similar to those that are used in the MAHRS ALE mode, a 500ms burst system briefly reported here. This signal islinkable to the HRA 5100 radio communication system used in airborne platforms (hra-5100.html).
As far as is recoverable in the web, "MAHRS"is the name of the HF radio-data standard used for data transmission while "Arcotel"was originally used to indicate the modem: recentTelefunken Racoms HF transceivers have integrated radio processor and modem, Arcotel is supposed to indicate just the radio processor. The company's name "Telefunken Racoms" is used since 2004 (http://www.army-guide.com/eng/firm3787.html).
MAHRS-2400 is a STANAG4285-like 2400Bd PSK-8 serial waveform (Pic. 1), although in this record (due to an unrelated signal) the carrier seems to be ~68 Hz lower than the usual 1800 Hz. Unlike STANAG 4285, this signal has a 106.6ms ACF and 2 x 8-tones preamble structure (Pic.2). Both the preamble and modulation technique of this signal are similar to those that are used in the MAHRS ALE mode, a 500ms burst system briefly reported here. This signal islinkable to the HRA 5100 radio communication system used in airborne platforms (hra-5100.html).
As far as is recoverable in the web, "MAHRS"is the name of the HF radio-data standard used for data transmission while "Arcotel"was originally used to indicate the modem: recentTelefunken Racoms HF transceivers have integrated radio processor and modem, Arcotel is supposed to indicate just the radio processor. The company's name "Telefunken Racoms" is used since 2004 (http://www.army-guide.com/eng/firm3787.html).
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| Pic.1 |
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| Pic. 2 |