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Christian Daniel -- maintech GmbH cd at maintech.de-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello, right now I have exactly one prototype. But we have more PCBs and we will populate them to fix the boards in the wild. When I have them ready, I will post it here. Best regards, Christian On 18.10.2012 06:44, Ronny Kunze wrote: > Hello , > > that are really good news. How can i get such a upgrade board ? > > Best regards, > > Ronny Kunze > > > Am 17.10.2012 18:55, schrieb Christian Daniel -- maintech GmbH: > Hello everybody, > > since we found out that the Atmel SAM3U SSC interface is only > capable of transporting 500ksps worth of I/Q data, we heard a lot > of complaining because of the too narrow bandwith. Especially > compared to the rtl-sdr with about 2msps, our 500ksps was bit > contrained. The fact, that the OsmoSDR is much more sensitive to > very small signals and brings a 14bit ADC instead of 8bits did not > really compensate for the bandwidth loss. > > Also the mismatch between E4000 output resistance and ADC input > brought some unwanted spectral effects. > > Instead of just releasing stuff, we decided to fix both issues: I > now have a prototype with simple stack-on-board, that adds two > op-amps to decouple the E4000 from the ADC and lower the impedance > and also this board connecteds the available FPGA pins to the MCI > (SD-Card) interface of the Atmel SAM3U. > > For this to get working, we had to rewrite major parts of the ARM > firmware and the FPGA VHDL code. Today this work is completed and > I can report success: The OsmoSDR now delivers up to 4msps at > 14bits. Also the strange peaks around Niquist/zero frequency are > gone. > > Find a screenshot of SDRangelove recording a DAB signal at 2msps > (SDRangelove needs some more love until it can cope with 4msps in > realtime - but we have verified that 4msps works without dropped > samples using the builtin FPGA test mode). > > http://www.cdaniel.de/download/osmosdr-dab-2mhz.png > > We will now integrate the changes into the OsmoSDR mainboard and > reroute the now free SSC pins to the pin headers instead of the > MCI interface. Also we will add the opamps. > > For the already produced OsmoSDR boards, we will have more of the > prototype stack-on-top-boards. > > We will keep you in the loop! > > Best regards, Christian > > PS: Regarding the DAB screenshot: - The horizontal lines are > correct - DAB uses a so called "pilot symbol", which only has > energy on a few carriers. That's why it looks like a pause in the > signal. - The vertical line is also correct - DAB does not use the > middle carrier to avoid I/Q offset problems on the transmitter > side. > > -- - --------------------------------------------------- | 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 | > --------------------------------------------------- >> > > - -- - --------------------------------------------------- | 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://www.enigmail.net/ iQEcBAEBAgAGBQJQgDBCAAoJEHkgzUIsAWriFHUH/iThyWHVp0ZrE2s0HhPQ0CNp AwTSnwZRr4k4LMX9AhKyilhAW5faJesfDGXeUiRR9+nUIF1r3PmHZU+W0mAE22Bg MKc2DYDQyrY6QNpSYpfRxomAVjiMaoeTexeMzBJdYSYbG28T0DFHJeza2X6ASIjE FTBh5le07UyhFiUfmCNUeYKsk7Hsb3eOjv+hCTWqVvwbFvx230tBFJKqMOMny7nc DXEQcg+7MiC4fQQkFTjAs7W/g+428Wzope0cP0M4r2ejnpuiReOf2eCJN2FjTvIi DP64shlwKfy5eymYvfhGme21Dy5SQOAawDLOwI305NhBD0UVXfWpvuxRN52uXPQ= =6jxb -----END PGP SIGNATURE-----