Saab Grintek MHF-50 MFSK Modem

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Saab Grintek MHF-50 MFSKMultiple Frequency Shift-Keying Modem
MHF-50.jpg
Frequencies 4245 kHzKiloHertz (kHz) 10^3 Hz4,245,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
4.245 MHzMegaHertz (MHz) 10^6 Hz
,4346 kHzKiloHertz (kHz) 10^3 Hz4,346,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
4.346 MHzMegaHertz (MHz) 10^6 Hz
,6407 kHzKiloHertz (kHz) 10^3 Hz6,407,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
6.407 MHzMegaHertz (MHz) 10^6 Hz
,6493 kHzKiloHertz (kHz) 10^3 Hz6,493,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
6.493 MHzMegaHertz (MHz) 10^6 Hz
,6504 kHzKiloHertz (kHz) 10^3 Hz6,504,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
6.504 MHzMegaHertz (MHz) 10^6 Hz
,8580 kHzKiloHertz (kHz) 10^3 Hz8,580,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
8.58 MHzMegaHertz (MHz) 10^6 Hz
,8603 kHzKiloHertz (kHz) 10^3 Hz8,603,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
8.603 MHzMegaHertz (MHz) 10^6 Hz
,12982 kHzKiloHertz (kHz) 10^3 Hz12,982,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
12.982 MHzMegaHertz (MHz) 10^6 Hz
,11237 kHzKiloHertz (kHz) 10^3 Hz11,237,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
11.237 MHzMegaHertz (MHz) 10^6 Hz
4,245 kHzKiloHertz (kHz) 10^3 Hz
4.245 MHzMegaHertz (MHz) 10^6 Hz
12,982 kHzKiloHertz (kHz) 10^3 Hz
12.982 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 4.245 MHzMegaHertz (MHz) 10^6 Hz4,245,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
4,245 kHzKiloHertz (kHz) 10^3 Hz
- 12.982 MHzMegaHertz (MHz) 10^6 Hz12,982,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
12,982 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation MFSKMultiple Frequency Shift-Keying,FSKFrequency-Shift Keying
ACFAutoCorrelation Function
Bandwidth 2200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).2.2 kHzKiloHertz (kHz) 10^3 Hz
0.0022 MHzMegaHertz (MHz) 10^6 Hz
2.2 kHzKiloHertz (kHz) 10^3 Hz
0.0022 MHzMegaHertz (MHz) 10^6 Hz
2.2 kHzKiloHertz (kHz) 10^3 Hz
0.0022 MHzMegaHertz (MHz) 10^6 Hz
Location South Africa
Short Description The MHF-50 MFSKMultiple Frequency Shift-Keying Modem by Saab Grintek Technologies in South Africa is a data modem that utilizes RTTYRadio TeleTYpe, 2-FSKFrequency-Shift Keying, and 33-MFSKMultiple Frequency Shift-Keying to transmit data
I/Q Raw Recording
Audio Sample

The MHF-50 MFSKMultiple Frequency Shift-Keying Modem by Saab Grintek Technologies in South Africa is a data modem that utilizes RTTYRadio TeleTYpe, 2-FSKFrequency-Shift Keying, and 33-MFSKMultiple Frequency Shift-Keying to transmit data. The unique format of the signal makes it easy to identify. The preamble consists of an RTTYRadio TeleTYpe 50Bd with 170 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift followed by a long tone, then a 2-FSKFrequency-Shift Keying starter with 390 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift and 54.4 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. Then, the main data portion of the signal is a 2200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). wide 33-MFSKMultiple Frequency Shift-Keying signal, with a 3-tone sequence to mark the end of the transmission.

The primary user of this modem is the South African Navy.


Samples[edit]

Sample 1:

Sample 2:

Sample Variant:

RTTYRadio TeleTYpe Preamble 2-FSKFrequency-Shift Keying Preamble MFSKMultiple Frequency Shift-Keying-33 Data MFSKMultiple Frequency Shift-Keying-33 EOT
RTTY.jpg
SANintro.jpg
SANdata.jpg
SANeot.jpg

Frequencies[edit]

8580 kHzKiloHertz (kHz) 10^3 Hz is a common frequency for this signal, and is often paired with 4346, 6504 and 12982 kHzKiloHertz (kHz) 10^3 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables). They all carry the same message(s) over and over so they are believed to be either channel markers, propagation markers and/or information about status of other South African Navy working channels on the bands. 4245, 6407, 6493 and 8603 kHzKiloHertz (kHz) 10^3 Hz are believed to be the above mentioned working channels and carry the actual messages because the length of transmissions may vary.

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]