Frank I can't answer your over sampling question perhaps Cecil can. I can however see that the ideas you are looking at are covered in Mini Circuits line up of GHz devices they now have for Wi Fi. There you will find transmitter/receiver QSD chips and other radio circuits that cover the hundreds of MHz and the GHz range. In their catalog it seems they have already got the vision of the future and jumped into the devices needed for SDR, but sort of Blue Tooth and Wi Fi, and IPod like.
I was thinking of up converting the entire HF band into the GHz ranges using their chips and let them do the tuning and QSD detection. Here one can experiment with wave guides etc. Also, it seems that three main chips are the hardware in this idea. A GHz range Pll, a mixer and the QSD. I have not done this yet, its just an idea I hope to get over onto. I seem to recal a GHz range chip for the i.f. section or mixer section? It appears though for the moment that in using these chips one does not have things like a broadband phase splitting toroid transformer or any such devices here, since the QSD i.f. is in the GHz range. Even wave guide ideas may not be required but you can try it if you choose. I have not fully studied the chips, and so, I am assuming the operations here and suggest others explore the data for the exact details of operation. And correct accordingly. I have also been looking at PLL chips in the GHz range that are controlled by the PC and also powered by the PC, the software comes from National Semiconductor if I recal. I have that on my PC and must go and look it up on the hard drive, I have not been back to look at it here in awhile but will soon. I want to upload that software since one can use it to explore the PLL chips in that series and start using them in designs. Borrowing on the software idea; one (the SDR software designer) then can make an application in the SDR software to control the PLL chip like they now do for the DDS section of current SDR USB controlled receivers. Experimentors Hint: I just upgraded to a new prototyping board. Three breadboards with multiple power supplies and test meters in a single device. It was used as a digital circuits trainer and is surplus at <http://www.fairradio.com/> NIDA Electronic Trainer, #NIDA-130 @ $49.50 Its the perfect SDR Lab! That is for DIP chips, one has to use "Surf Boards" to mount the surface mount ICs in the breadboards. Jameco carries "Surf Boards." Winters coming and so I think now folk will set down and do the indoor work of exploring their circuits. _____________________________________________________________________ PrivatePhone - FREE telephone number & voicemail. A number so private, you can make it public. http://www.privatephone.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/soft_radio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
