Inmarsat-D+ Downlink

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Inmarsat-D+ Downlink
Inmarsat-D.jpg
Frequencies 1525.0 MHzMegaHertz (MHz) 10^6 Hz1,525,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
1,525,000 kHzKiloHertz (kHz) 10^3 Hz
,1559.0 MHzMegaHertz (MHz) 10^6 Hz1,559,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
1,559,000 kHzKiloHertz (kHz) 10^3 Hz
1,525,000 kHzKiloHertz (kHz) 10^3 Hz
1,525 MHzMegaHertz (MHz) 10^6 Hz
1,559,000 kHzKiloHertz (kHz) 10^3 Hz
1,559 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 1,525 MHzMegaHertz (MHz) 10^6 Hz1,525,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
1,525,000 kHzKiloHertz (kHz) 10^3 Hz
- 1,559 MHzMegaHertz (MHz) 10^6 Hz1,559,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
1,559,000 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 MFSKMultiple Frequency Shift-Keying
ACF
Bandwidth 512Hz0.512 kHzKiloHertz (kHz) 10^3 Hz
5.12e-4 MHzMegaHertz (MHz) 10^6 Hz
0.512 kHzKiloHertz (kHz) 10^3 Hz
5.12e-4 MHzMegaHertz (MHz) 10^6 Hz
0.512 kHzKiloHertz (kHz) 10^3 Hz
5.12e-4 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description Inmarsat D+ (and it's predecessor, Inmarsat D) is Inmarsat's satellite paging system. The main use of this technology nowadays is in tracking trucks and buoys and SCADA applications.
I/Q Raw Recording
Audio Sample
Inmarsat D+ (and it's predecessor, Inmarsat D) is Inmarsat's satellite paging system. The main use of this technology nowadays is in tracking trucks and buoys and SCADA applications. The original Inmarsat-D terminals were one-way (to mobile) pagers. The newer Inmarsat-D+ terminals are the equivalent of a two-way pager. This signal is the downlink from satellite to mobile station.


Characteristics[edit]

The downlink comprises of a 32 MFSKMultiple Frequency Shift-Keying signal at baudrates of 20 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. and 40 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. The bandwidth of the signal is 512 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., but the channel allocated to the downlink is 2.5 kHzKiloHertz (kHz) 10^3 Hz wide to account for doppler shifting interference. There is a frequency shift of 20 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). for each tone.

Samples[edit]

Frequencies[edit]

  • Rx (Downlink): 1525.0 to 1559.0 MHzMegaHertz (MHz) 10^6 Hz
  • Tx (Uplink): 1626.5 to 1660.5 MHzMegaHertz (MHz) 10^6 Hz

Additional Links[edit]

Additional Images[edit]