[amsat-bb] Nusat-1 and Nusat2

[Dani EA4GPZ]

El 09/08/16 a las 04:31, Scott escribió:
> Telemetry from both of those satellites is quite active; while it's fun
> receiving the RF and pulling out the raw hex data, unfortunately there
> is currently NOT a decoder that I am aware of to display meaningful values.
> 
> The bulk of the work to get us this far was done by Dani Estevez.  His
> work is extraordinary and is documented at:
> 
> http://destevez.net/2016/06/trying-to-decode-data-from-nusat/

Thanks for linking my blog, Scott. Unfortunately that's all we can do by
now.

The satellite uses CBOR to compress the telemetry into small binary
packets. Some of the guys at Satellogic (the company that operates the
satellites) were going to send me some details, but nothing received so
far. Probably it's not so easy and they're busy enough.

The downside is that we don't even have a way to check that the packets
are received without bit errors. The last 4 bytes of the packet seem to
be the ones which vary the most, so kudos if someone can recognise that
as a CRC of the packet. I tried for a while, but got nothing.

By the way, it's 40k baud, not 38k4. It eats a huge chunk of spectrum
(about 80kHz).

73,

Dani.