[Discuss-gnuradio] N210s, USRP2s, daughterboards for sale
My employer is closing up shop and we’re selling our Ettus gear (along with some other lab gear). 4 - N210 2 - USRP2 2 - DBSRX 6 - DBSRX2 (At least one of these has been modified, though) 3 - SBX 5 - LFRX 1 - LFTX 1 - Basic TX 1 - Basic RX 2 - XCVR2450 1 - WBX Our CFO is motivated to sell so email me if you are interested and I’ll put you in contact. -Marc ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] LFRX A:A and A:B as independent channels in GRC
Using just Gnu Radio Companion, is there a way to get the A and B inputs of an Ettus LFRX (or BasicRX) in an N210 as independent channels? Specifying A:AB as the subdevice and using a Complex-to-Float might work, but I'm wondering if the complex rx chain in the FPGA would conflate what are otherwise independent signals. -Marc ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] LFRX A:A and A:B as independent channels in GRC
On Feb 7, 2013, at 5:42 PM, Josh Blum wrote: > On 02/07/2013 05:25 PM, mepard wrote: >> Using just Gnu Radio Companion, is there a way to get the A and B >> inputs of an Ettus LFRX (or BasicRX) in an N210 as independent >> channels? > > Setup the source block for 2 channels. > > Set the subdev/frontend spec to "A:A A:B" > > This makes DSP0 get the data from dboardA (the only one there), and > frontend A, and DSP1 gets from frontendB. Exactly what I had in mind. Thanks! -Marc ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Configure UHD source and File sink to save integers
I'd like to feed a File Sink from a UHD Source with 4 channels -- 2 motherboards, each with A:A A:B subdev specs. To cut down on the file size, I'd like to record integers instead of floating point. Which data type should I tell the UHD source to produce? Which type should I tell the File Sink to record? What conversions do I need in between? I'd like to stay in GRC, if possible. TIA -Marc ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Configure UHD source and File sink to save integers
On Mar 4, 2013, at 2:43 PM, Josh Blum wrote: > > On 03/04/2013 02:36 PM, mepard wrote: >> I'd like to feed a File Sink from a UHD Source with 4 channels -- 2 >> motherboards, each with A:A A:B subdev specs. To cut down on the file >> size, I'd like to record integers instead of floating point. >> >> Which data type should I tell the UHD source to produce? Which type >> should I tell the File Sink to record? What conversions do I need in >> between? I'd like to stay in GRC, if possible. >> > > Sure thing. You can set the file sink to integer (int32), and either set > the usrp source block to vita word32 or sc16 type (both are 32 bits per > sample). > > Thats still 4 streams, not sure if you are interleaving them or using 4 > file sinks. > One thing I forgot is that I'd like to convert complex to a single sint16 with just the "real" part, like I can convert complex to single float. It doesn't look like there is the equivalent of Complex To Real for integers. Is there an alternative to converting to floating point and back? -Marc ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Configure UHD source and File sink to save integers
On Mar 4, 2013, at 6:11 PM, Josh Blum wrote: > On 03/04/2013 03:07 PM, mepard wrote: >> >> >> One thing I forgot is that I'd like to convert complex to a single >> sint16 with just the "real" part, like I can convert complex to >> single float. It doesn't look like there is the equivalent of Complex To >> Real for integers. >> >> Is there an alternative to converting to floating point and back? > > you could vector to streams, and null sink the second stream. > > * 1 input stream of vec length 2 and item size short > * 2 output streams of item size short This works well. Thanks! -Marc ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] About "FPGA-ADC/DAC and RF frontend" Latency
Hint 1: If both 210s are on the same PPS and frequency reference and the FPGA clocks are synchronized to the PPS, you can schedule the transmit and receive to within one tick of the 100 MHz ADC clock. Hint 2: Cross correlate the transmitted and received samples. The lag will be independent of Ethernet and IP delays. -Marc ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
