Simply open this app and search the satellite database for Inmarsat.They provide services such as satellite phone communications, broadband internet, and short text and data messaging services.Geostationary means that the satellites are in a fixed position in the sky and do not move.
From almost any point on earth at least one Inmarsat satellite should be receivable. This channel is mainly used by vessels at sea and contains Enhanced Group Call (EGC) messages which contain information such as search and rescue (SAR) and coast guard messages as well as news, weather and incident reports. More information about L band reception is available at UHF-Satcoms page. See the end of this post for a tutorial on modifying a GPS antenna for Inmarsat reception. This dongle includes a bias tee which is required for powering the LNAs or active antennas, and is improved so that L-Band reception is much more stable. Cost: 20.95 USD. This antenna is designed for receiving L-band signals and does a very good job at it. Cost: 39.99 USD. We tested some generic dongles at an ambient temperature of 16 degrees and it worked well, but when run in direct sunlight the RX eventually failed after 30 - 60 minutes. The E4000 should work better at L band frequencies but these tuners are rare and expensive now. NOTE that our RTL-SDR V3 does NOT have this problem thanks to its passive cooling and improved thermal design. We tested two antennas, one was an air gap L-band patch antenna supplied by Outernet which was used together with one or two 15 dB LNAs. Both worked well, with the Outernet air gap patch antenna being better. Update: We have also tested our new active L-band patch antenna that we manufacture and sell and this works very well too. Inmarsat C Decoding Software Program How To Modify SuchWe show you how to modify such an antenna at the end of this post. ![]() Also note that you will need a bias tee, or bias tee compatible dongle to power a GPS antenna. Also see another post for information from Adam 9A4QV on dimensions for building a home made patch antenna. You can build at home a RHCP helix antenna with about 25 turns for about 15dBi of passive gain. UHF-Satcoms L-Band page shows some good information on building such an antenna. If you have a TV dish then this can also be used with a smaller LHCP (LHCP as the dish reflects the polarization) helix antenna as the feed. Thank you Adam for the comment on these antennas.). Note that to use this LNA you will need a dongle with a bias tee, such as our RTL-SDR V3, or an external bias tee. As a second choice Adams LNA4ALL should also work decently, but in our experience the L-Band SNR is not as good as with a dedicated Inmarsat LNA. It has a VSWR of about 1.1 at 1.5 GHz and 1.45 at 1.56 GHz. As of 20192020 you can instead just use our patch antenna to almost guarantee reception. Inmarsat C Decoding Software Program Free Android AppWe think that the easiest way to do this is to use a free Android app called Satellite AR.
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