[hpsdr] Metis

Bob Cowdery bob at bobcowdery.plus.com
Sun May 8 13:18:45 PDT 2011


Hi all

Firstly I would like to express my thanks to all involved in the Metis
project. A great piece of kit which performs very well. The led's are
especially well thought through and were an immense help in bug finding.

I just got my software up and running a few days ago and have upgraded
to firmware 1.2. The 'Metis - How it works' was very clear and nicely
written. There is just one thing I haven't quite figured. The wide band
bandscope spec says it sends 4096x16 bit blocks of data but also says
the payload is

<0xEFFE><0x01><End Point><512 x 16 bit samples>

When I actually try and receive this data I get a data length of 1028
bytes (after the header bytes). I don't seem to get any other data
except the IQ frames.

Unless I've done something daft (which I probably have) should there be
a sequence number in the above spec which would make the data 1024.

How do I handle this data - does it come in 8 frames of the above to
make 4096. If so how do I know where the start of the data is or do I
just assume the first frame I see is the start and count off blocks of 8
frames?
What is the frequency of the data?

Thanks for any help
Bob



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