Inmarsat 4F2
Submitted by blh on Tue, 05/08/2008 - 20:38.
Is anyone else seeing a number of wide-band signals on 4F2? Particularly around 1526-1537?
Also I'm seeing an odd type on 1537.920 that I haven't seen before. Any ideas on what this mode is? Has this been seen on any of the others?
blh
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Inmarsat 4F2
Howdy,
The 1537.920 is an 8.4Kbps signal, its most probably a Aero-I support channel at a guess.1526.100, 1532.700, 1542.500, 1542.700, 1545.900 are most likely the BGAN service, the data seems to have framing such as found in GSM and the mode is known to be based on this. The three QPSK's around 1546.062 are all AERO-I Acars type downlinks, they have a particularly characteristic framing noise that is regular.
regards,
pjm