Hi All, I have always loved working with USRP's by having two of them in college( USRP N210). Now that i am leaving college, I want to know if there's any cheap sdr receiver working on gnuradio that i can work on at home because i can't afford an USRP. I checked online and found these two. http://www.amazon.com/DVB-T-Receiver-Low-Cost-Soft... http://www.amazon.com/Newsky-Receiver-Low-Cost-Sof... Are these good enough. can any one in the group suggest better alternatives to work on?
on 2013-01-20 01:11
on 2013-01-20 03:02
for rtl sdr, there is the list in reddit. http://www.reddit.com/r/RTLSDR/comments/s6ddo/rtls... http://www.reddit.com/r/RTLSDR/comments/rpq5w/list... -- s Fosforo ------------------------------------------------------------- "Se eu tiver oito horas pra cortar uma arvore, passarei seis afiando meu machado." -Abraham Lincoln -------------------------------------------------------------
on 2013-01-20 13:31
Hi Karan, I recommend reading this page: http://gnuradio.org/redmine/projects/gnuradio/wiki/Hardware On Sat, Jan 19, 2013 at 07:10:31PM -0500, Karan Talasila wrote: > Hi All, > I have always loved working with USRP's by having two of them in > college( USRP N210). Now that i am leaving college, I want to know if there's > any cheap sdr receiver working on gnuradio that i can work on at home because i > can't afford an USRP. I checked online [...] > > Are these good enough. can any one in the group suggest better alternatives to > work on? That question is impossible to answer, because "good enough" is a relative term. RTLSDRs are unbeatable when it comes to their price tag, so you can hardly go wrong buying one of them. They might be "good enough" for you. However, in terms of frequency range (and any other figure of merit), they can't keep up with USRPs. Also, no Tx. You have to decide for yourself if that's good enough for you. Note that many people on this list, myself included, have biases towards specific hardware (and vendors). So be specific when asking for advice; if you don't know which noise figures (or whatever) you need, it helps if you specify which type of project you're working on. MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
on 2013-01-20 16:50
On Sat, Jan 19, 2013 at 07:10:31PM -0500, Karan Talasila wrote: > > http://www.amazon.com/DVB-T-Receiver-Low-Cost-Soft... > > http://www.amazon.com/Newsky-Receiver-Low-Cost-Sof... Either one of those is fine. NooElec is a reputable seller. You can see the difference in operating frequency range for the E4000 vs. FC0013 here: http://sdr.osmocom.org/trac/wiki/rtl-sdr I have heard that the FC0013 has somewhat better receive sensitivity than the E4000, but I have not verified that. The E4000 has a wider operating frequency range.
on 2013-01-20 18:33
On 01/20/2013 10:49 AM, Michael Ossmann wrote: > > I have heard that the FC0013 has somewhat better receive sensitivity > than the E4000, but I have not verified that. The E4000 has a wider > operating frequency range. > > _______________________________________________ > Discuss-gnuradio mailing list > Discussemail@example.com > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > Something to note about FC0013 based dongles is that while the FC0013 has an L-band input, it's typically *NOT CONNECTED* on any of the dongles out there. The E4000 is great tuner, but out of production now, due to the company who made it going out of business. The up and coming logical replacement in the market for the E4000 is the R820T, which covers a continuous frequency range of 24Mhz to about 1.5GHz, with sensitivity falling off precipitously above 1.3GHz, but overall a very nice tuner. Again, eBay has them in two different physical formats. But these things aren't, in any sense, comparable to a USRP in many dimensions. The maximum no-samples-dropped sample rate is only 2.4Msps (even though you can ask for 3.2Msps, the hardware starts dropping samples above 2.4Msps). They have an 8-bit ADC, so maximum dynamic range is 48dB. The decimator inside the RTL2832U chip isn't very good, and only really works properly at 2Msps--alias suppression at other sample rates isn't nearly as good. Isolation between the digital side and RF receiver side is poor, which means more spurs and higher noise floor than devices that are more "purpose built". But for $10.00 apiece in some cases (patiently waiting for the ebb and flow of market-economics on eBay to drive the price down can allow you to pick them up for as little as $10.00 apiece), they're a good value for cheap experiments. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
on 2013-01-21 02:11
Hi All, Thank you all for replying.. @Fosforo I will check the reddit.. @Martin I checked the gnuradio site. I understand the quality issues and limitations of a usb dongle of sdr. But my main intention is to not leave working on gnuradio.So I was looking for alternatives to work and learn on my own. I have no specific project in mind right now. I feel that if you leave working on this platform for a few months, you will take a long time to get back again because of the rate at which changes happen. So just wanted to be in touch with it. @Ossman Thanks. I will buy one of these two and try. @Marcus Thanks for a detailed explanation on the performance limits and limitations for usb based sdr's. I understand it better now.