Re: Test version 5 of the Multipsk version 4.43.1 - Improvement of the EGC decoding


tseug
 

Hopefully this won't class as 'off topic'

When reading Patrick's guide note that the satellite info is currently as follows:

SATELLITE ID = 0 (Long 99W) Seq = 6 Psmc1 = 1545.0200MHz Psmc2 = 1545.2050MHz
SATELLITE ID = 1 (Long 54W) Seq = 5 Psmc1 = 1545.0150MHz Psmc2 = 1545.1950MHz
SATELLITE ID = 2 (Long 142.5E) Seq = 4 Psmc1 = 1545.2000MHz Psmc2 = 1545.0100MHz
SATELLITE ID = 3 (Long 24E) Seq = 3 Psmc1 = 1545.1900MHz Psmc2 = 1545.0050MHz
SATELLITE ID = 5 (Long 144E) Seq = 2  Psmc1 = 1545.1050MHz
SATELLITE ID = 6 (Long 25.5E) Seq = 1  Psmc1 = 1545.1150MHz
SATELLITE ID = 7 (Long 97.5W) Seq = 0  Psmc1 = 1545.1100MHz
 
However, as previously mentioned the system runs as a Virtual Inmarsat I3 Network (to maintain compatability with old mobile equipment) overlaid onto the Inmarsat I4 System using 
the following actual satellites
 
SATELLITE ID = 0, Inmarsat 4F3 (*) Seq = 6 Psmc1 = 1545.0200MHz Psmc2 = 1545.2050MHz
SATELLITE ID = 1, Inmarsat 3F5 (Long 54W) Seq = 5 Psmc1 = 1545.0150MHz Psmc2 = 1545.1950MHz
SATELLITE ID = 2, Inmarsat 4F1 (*) Seq = 4 Psmc1 = 1545.2000MHz Psmc2 = 1545.0100MHz
SATELLITE ID = 3, Alphasat (Inmarsat 4AF4) (*) Seq = 3 Psmc1 = 1545.1900MHz Psmc2 = 1545.0050MHz
SATELLITE ID = 5, Inmarsat 4F1 (Long 144E) Seq = 2  Psmc1 = 1545.1050MHz
SATELLITE ID = 6, Alphasat (Inmarsat 4AF4), (Long 25.5E) Seq = 1  Psmc1 = 1545.1150MHz
SATELLITE ID = 7, Inmarsat 4F3 (Long 97.5W) Seq = 0  Psmc1 = 1545.1100MHz

You asked about patch antennas - 
rtlsdrblog also market a patch antenna (worst performance out of all those I mention here BUT it's already waterproof and contains an LNA plus if you want to look at Iridium it will do for that as well).
nooelec make a microstrip patch which will work
sdrkits market a modified 'gps' puck which is suitable.
Better than all of those is the home build design for a simple airgap patch by Adam, 9A4QV, and if you want to get a touch more gain then a home made airgap based on the outernet patch will give you that.
The frequency response of each of the above is not exactly the same
Another option would be a small home-made helical (see uhf-satcom L-band lots of useful info about satcom on the other pages there as well but bear in mind the frequency listings are old - another very good source of satcom info is the long-established irc channel 'hearsat' which is currently on the freenode network)

For an LNA I'd look at the nooelec sawbird IO or sawbird IO+ to give filtering and amplification rather than a wideband LNA

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