OsmoSDR progress

Christian Daniel -- maintech GmbH cd at maintech.de
Tue Mar 6 10:49:48 UTC 2012


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Hiho,

following up on the experiments it seems we're getting somewhere - at
least I think that the sample values now make more sense.

I sweeped a local DVB-T frequency with 1MHz filter and AGC in
automatic mode (hence the low SNR - I guess).

I will run the complete scan now.

Best regards,
Christian

On 01.03.2012 09:47, Christian Daniel -- maintech GmbH wrote:
> 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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