OsmoSDR progress

Christian Daniel -- maintech GmbH cd at maintech.de
Thu Mar 1 08:47:08 UTC 2012


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Hello everybody,

following up on Harald's great progress I wrote some tool to verify the
RF purity of our design. This is the last step before we can order the
final PCBs and start production.

Sadly from my current results we have some room for improvements. Right
now I'm reviewing the E4000 driver as I suspect the visible steps in the
attached spectrum to be switching points in the E4000. Perhaps something
can be improved here...

Stefan told me that without any antenna the output levels of the E4000
should be below the LSB limit of the ADC - clearly we have a lot of
noise on the signal. But we also don't have any I/Q calibration and I
can see significant offsets on these lines...

I'll keep you posted!

Cheerio,
Christian

- -- 
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| maintech #      Dipl. Inf (FH) Christian Daniel |
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| http://www.maintech.de           cd at maintech.de |
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