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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

- -- - --------------------------------------------------- | maintech # Dipl. Inf (FH) Christian Daniel | | GmbH ### Otto-Hahn-Str. 15 · D-97204 Höchberg | - --------------------------------------------------- | AG Würzburg, HRB 8790 Tax-ID DE242279645 | - --------------------------------------------------- | http://www.maintech.de cd@maintech.de | - ---------------------------------------------------