Bob, I have also been told of a significant carrier presence during SSB transmit. I have been trying to confirm this. I am also using a Delta 44 card.
--Larry W8ER ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <flexradio@flex-radio.biz> Sent: Thursday, November 02, 2006 9:09 PM Subject: [Flexradio] Hey Bob - IQ DC offset hooks > > > Hi Bob, > > > > Is there a way to get at Tx I&Q DC offsets in your code. I couldn't fine > any. > > > > Some of the SDR stations on the air have noticeable carrier present during > SSB TX. > > > > Using a spectrum analyzer I've noticed that during TX image cancellation I > can get the image > > 20-30 db below the residual carrier! > > > > After thinking about this I decided to measure the output of my Delta 44 > sound card. It has offsets of > > -12.8mV on the I channel and -4.11mV on the Q. I would imagine some cards > are worse. > > > > It would be sweet to null the carrier another 1,000%. > > > > 73, > > John > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > /pipermail/flexradio_flex-radio.biz/attachments/20061102/8f0b93a4/attachment.html > _______________________________________________ > 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 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 Homepage: http://www.flex-radio.com
