MSM-1250 Modem

From Signal Identification Wiki
Jump to: navigation, search
MSM-1250 Modem
MSM-1250.jpg
Frequencies 3 MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
,30MHz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
3,000 kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
30,000 kHzKiloHertz (kHz) 10^3 Hz
30 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
- 30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 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 FSKFrequency-Shift Keying
ACFAutoCorrelation Function
Bandwidth 2400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).2.4 kHzKiloHertz (kHz) 10^3 Hz
0.0024 MHzMegaHertz (MHz) 10^6 Hz
,2500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).2.5 kHzKiloHertz (kHz) 10^3 Hz
0.0025 MHzMegaHertz (MHz) 10^6 Hz
2.4 kHzKiloHertz (kHz) 10^3 Hz
0.0024 MHzMegaHertz (MHz) 10^6 Hz
2.5 kHzKiloHertz (kHz) 10^3 Hz
0.0025 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description MSM-1250 (Medium Speed Modem) is a 10 FSKFrequency-Shift Keying-2 OFDMOrthogonal Frequency-Division Multiplexing digital data protocol used by the stand-alone modem "SkyFax", used to transmit and receive faxes on HFHigh Frequency (3-30 MHz).
I/Q Raw Recording
Audio Sample

Also known as Racal/Thales Skyfax, Racal/Thales MSM, SKYFAX, Skyfax MSM, JAVELIN MSM-1250, and other variations, MSM-1250 (Medium Speed Modem) is a 10 FSKFrequency-Shift Keying-2 OFDMOrthogonal Frequency-Division Multiplexing (Orthogonal Frequency Division Multiplex) digital data protocol used by the stand-alone modem "SkyFax", used to transmit and receive faxes on HFHigh Frequency (3-30 MHz).

There are 10 parallel FSKFrequency-Shift Keying channels used, each channel spaced 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). apart and with 150 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). spacing within the channel. Each channel transmits 125 bpsBits per second (bps), giving a transfer capacity of 1250 bpsBits per second (bps).

This protocol is often seen with MIL 188-141 (ALE). This protocol was developed by Racal (Now Thales Group) and were used in RC5000 series modems marketed by Racal Canada.

Mode Samples[edit]

MSM-1250 MSM-1250 w/with ALEAutomatic Link Establishment: MSM-1250 EOT/Idle:
MSM-1250.jpg
MSM-1250 ALE.jpg
MSM-1250 IDLE.jpg

Decoding Software[edit]

None so far. Please add one if you know one.


Additional Links[edit]

Additional Images[edit]