Rob, Let me confirm Roland's statement that the DC hump has nothing to do with the SDR-1000 and everything to do with the sound card. Better cards have lower DC offset and/or noise. The FLEX-5000 does not have this hump because it uses a built in high performance A/D converter (i.e. no hump). Janus/Ozy offers the best performance for SDR-1000 use. 73, Gerald
Gerald Youngblood, K5SDR FlexRadio Systems Ph: 512-535-4713 Fax: 512-233-5143 Email: [EMAIL PROTECTED] Web: www.flex-radio.com > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Roland Etienne > Sent: Monday, October 22, 2007 1:50 AM > To: 'Rob Moore'; flexradio@flex-radio.biz > Subject: Re: [Flexradio] FlexRadio Digest, Vol 30, Issue 21 > > > -----Message d'origine----- > De : [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] De la part de Rob > Moore Envoyé : dimanche 21 octobre 2007 23:58 À : > flexradio@flex-radio.biz Objet : Re: [Flexradio] FlexRadio > Digest, Vol 30, Issue 21 > > Rob, > > I have an SDR-100 as well which I use primarily for SWL'ing. > I've been aggravated by the "DC Hump" as well and like you am > wondering what can be done about it. I also have an SDR-IQ > which isn't quite as sensitive as the SDR-1000 but works > quite well and has no sign on the hump. I know that the > SDR-IQ doesn't use a sound card and instead has the I_Q > demodulator and decimator on board so perhaps that's why it > doesn't have any hump, but it seems like this is a design > defect with t he SDR-1000 that could be solved with a little effort. > > Rob (coincidence!) > > SDR-IQ and SDR-1000 are completely different designs, the > SDR-IQ have the ADC on HF, there is no mixing process. > > For information, SDR-1000 with janus-Ozy gives an unnoticeable hump... > > 73, Roland f8chk. > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio > Homepage: http://www.flex-radio.com/ > > > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio > Homepage: http://www.flex-radio.com/ > > _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
