Some more lessons learnt on working with iridium-toolkit:

* Don't rely on the preconfigured center frequency - find the average strongest signals in gqrx and use that as center.
* Tuning lna gain with the `gain=` config makes a big difference.

Meanwhile, I found the JAERO source contains some bits for OQPSK decoding so I'm going to have a stab at using that as a basis for an inmarsat decoder.

I'm also modifying JAERO to take an UDP input stream from gqrx instead of soundcard output, which should come in handy.
This last bit should actually be pretty easy to do.

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