QF1D512 Here is a link to useful FIR engine chip: http://www.quickfiltertech.com/html/qfilter_page.php?content_id=45 They offer a DIP version for experimentation: http://www.quickfiltertech.com/html/qfilter_page.php?content_id=59 Mouser stocks the parts. QS1R: The current status is that I am working on integrating the QF1D512 part into the QS1R receiver prototype. I have no new projected availability for QS1R. In fact it appears that interest may be somewhat limited - enough so that it would not be worthwhile to offer assembled units. In that case the design files will be posted from anyone who wants to build a board.
Here I will post information about the current status of SRL-LLC projects and other general SDR information. SRL-LLC website: www.srl-llc.com