Hi Everyone, I'm interested in getting back into the software defined radio area =
again. The last thing I did was the R2-DSP, and it looks like there = have been some good strides made since then. It looks like the SDR-1000 = is an open design, but I'm still looking for the schematic and possibly = source code of the control circuitry board. I'm also looking for the = source code and the description of the protocol used to communicate with = the DDS and relays (or possible micro-controller that controls them). = Can someone direct me to all that information? I don't want to just purchase an SDR-1000, and play with the software; I = would like to play with the hardware a little more this time, than I did = with the R2-DSP. Analog Devices is sampling the AD9954 now, and it = looks possibly more attractive than the AD9854. First, it has 14 bits = on the D/A, and I think it should have lower phase noise; third, it = dissipates about 1/4 the power, which is really nice because the AD9854 = some special requirements when it came to the circuit board design = because of the heat dissipation. Down sides are that you will need to = use two AD9954's or perhaps you could use a Johnson divider and drop 6 = meters, and the supply voltage is 1.8 volts, and I suppose there may be = some issues with the serial programming instead of parallel and syncing = the two DDS devices. What other things should I consider? Are there better reference oscillators available now? Are there other = tweaks to the circuit that you would recommend? Why has nobody made Gerber files available for the PC boards for the = SDR-1000? If I did a revised design, in keeping with the open nature of = this project, I would want to make those available under GPL. In our = lab at school, we have had very good luck with using surface mount = components and the toaster oven method of applying them. It is so much = faster than soldering through hole parts in, and a lot less tricky than = soldering surface mount components by hand. We have also been making = our own boards using a direct printing method on thin PCB material using = a Xerox wax ink printer and acid etch. The cost of producing a couple = of sets of boards using these methods is appealing to me at least, and I = think I could use them in at a couple of classes I teach. 73, Rob, KL7NA -- = Rob Frohne, Ph.D., P.E. E.F. Cross School of Engineering Walla Walla College 100 SW 4th Street College Place, WA 99324 (509) 527-2075 http://www.wwc.edu/~frohro -------------- next part -------------- A non-text attachment was scrubbed... Name: frohro.vcf Type: text/x-vcard Size: 318 bytes Desc: not available Url : http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachm= ents/20060501/17dc9d8a/frohro.vcf
