The 9850-9851 don't have a quadrature output ... now you could easily take the AMQRP DDS-60 (9851) and use a divide by 2 quadrature generator and get 0-30 Mhz with the option of several ways to control it (PIC, AVR Butterfly, PC)
Other choices are a 9854 which does have IQ outputs and is available in a kit from from KangaUS as the IQ-Pro(It's not on the website yet but you can email Bill and he'll set you up with one) ... I'm using the older IQ-VFO in a DC SDR front end I'm putting together right now But unless you are building or modifying a Direct Conversion receiver, the IQ VFO/IQ-Pro aren't really necessary because as I noted most BFOs are limited in range and an simple LC network will generate the quadrature for a couple of bucks ... main drawback to an IF SDR is that the crystal filters ahead of it limit the passband the soundcard/ADC sees .. advantage is you have better than excellent sideband supression because the crystal filter already takes care of it and then you get at least another 40db of supression from the quadrature circuit I've been using Alberto's SDR program with a Ten-Tec RX320D for almost two years now but I still can't wait to see what it'll do with a true IQ input into the Delta44 soundcard I picked up a couple of months back JR --- In [email protected], Bob Stewart <[EMAIL PROTECTED]> wrote: > What about the AD9850 (and subsequent) chips? I keep > looking at the NJQRP DDS Daughtercard and thinking > "get one and bring out the Q output". Unfortunately, > though, I'm just in the thought phase of this, and > don't have any actual experience with it yet. But, it > seems such an obvious thing to do that I'm surprised > that no-one has put together a single-board SDR kit > with it. Or have they and I'm just displaying > newbishness? :o) > > Bob - AE6RV > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> 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/
