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Christian Daniel -- maintech GmbH cd at maintech.de-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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/ iQEcBAEBAgAGBQJPTzeFAAoJEHkgzUIsAWrilLMH/1s45+iDzv0+YqNpql5sZSs0 88uWFZbbpd22HVY4tifMpe5n4E1bJJBK2Sfuq9t4HDIV/Tka9KijCDT7a3BVbzzQ TqQ3iimSdS7/+UYiNI9OPhdpFaBE1tuCcvWg4lBXct125mynOM/VajLMsXDd/4E6 UVtwUqFxWFXhWXi7/jT/P8+2dhUHZ0sLTsWNp7FS8+SCn7/Uu9QvEc0ZIr8ufaiK NwWTM8O16mUEn0iFMme8WdBhTsi7TTiK23Wd7RZGkZfZeMEr93jPtpvlvkDRlwiF RJC158eAZASsXfyRAw1wr59GVsJF4S7HV88LkKVFS4FOU2t09b/DKZplWnfp0IQ= =5KOA -----END PGP SIGNATURE----- -------------- next part -------------- A non-text attachment was scrubbed... Name: spectrum.png Type: image/png Size: 36609 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20120301/fc453d89/attachment.png> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: sweep.txt URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20120301/fc453d89/attachment.txt> -------------- next part -------------- A non-text attachment was scrubbed... Name: spectrum.png.sig Type: application/octet-stream Size: 287 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20120301/fc453d89/attachment.obj> -------------- next part -------------- A non-text attachment was scrubbed... Name: sweep.txt.sig Type: application/octet-stream Size: 287 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20120301/fc453d89/attachment-0001.obj>