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Christian Daniel -- maintech GmbH cd at maintech.de-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 at maintech.de | - --------------------------------------------------- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJPVevEAAoJEHkgzUIsAWriWq4H/0S2cM1NqWrDPSFKH7OgDAc7 FVlIoY8WfXbvPCqlTUtVZDAnDpMyZbWExV+F1PY5NwHEGhPR1P48gE6NDPwS9p6D yaFfUHW0+gA72jqr3vJ+6E6GQnjLbl0NvCkTGRtbCRiKvaX6O1Oknuf0cXIedlFr 2zIML7asuMutON4edpwt5OyCS414rnpFNZ4Vm1MzBG/cuXMMMPyw+1VRb39vvvBt SyNvcG7DzvZro6j1f4Z8bHZVHKgBVsk5+si2BKws8vW6IfUah5isdxTV59083Fl/ s5SLSwj+hm2IGD0c0W435T0PiQB9jVHv4KDTLRA9JGp4sF7AG9GSvR1/owbKA6o= =pOJM -----END PGP SIGNATURE----- -------------- next part -------------- A non-text attachment was scrubbed... Name: dvb-t-sweep.png Type: image/png Size: 25618 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20120306/205738d9/attachment.png> -------------- next part -------------- A non-text attachment was scrubbed... Name: dvb-t-sweep.png.sig Type: application/octet-stream Size: 287 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20120306/205738d9/attachment.obj>