Ah sorry I wasn't specific. This was from years ago, the numbers I used were just meant to be an example, not accurate.
On Tue, Aug 25, 2015 at 10:25 PM, Marcus D. Leech <[email protected]> wrote: > On 08/25/2015 10:17 PM, devin kelly wrote: > > You can have each USRP on the same computer or not, that shouldn't matter. > > I've done this test with some USRP2's and I remember what we did was > transmit a CW tone from one to another and measure a frequency offset > (maybe 10s of kHz?). Basically, transmit a tone at some known frequency > (like 200 MHz) and measure the received frequency (maybe something like > 200.02 MHz) and then add the 0.02 into you center frequency for this test. > > You can also just synchronize the USRPs with a 10MHz reference and 1PPS. > > Devin > > The USRP2 uses a 2.5PPM master on-board clock, so at 200Mhz tuned > frequency, the max it can be off is about 500Hz. For narrowband > transmission, > that may be too much, but I'd be very surprised to see 20kHz offset with > a 200MHz carrier. > > > > > On Tue, Aug 25, 2015 at 5:14 PM, John Garrick <[email protected]> > wrote: > >> Hello, >> >> I want to transmit the data between two USRP's and make them communicate >> with each other. But I guess the packets are not being received >> properly. >> I am connected the two USRP's to the same laptop and trying it. Is that >> applicable? I mean, will it work if I do that? Or should I connect to >> two computers and perform that? I have been receiving this error. >> >> linux; GNU C++ version 4.8.4; Boost_105500; >> UHD_003.009.git-144-g407e3086 >> >> Using Volk machine: avx_64_mmx >> -- Opening a USRP1 device... >> -- Using FPGA clock rate of 64.000000MHz... >> >> No gain specified. >> Setting gain to 56.250000 (from [0.000000, 112.500000]) >> >> UHD Warning: >> The hardware does not support the requested RX sample rate: >> Target sample rate: 0.050000 MSps >> Actual sample rate: 0.250000 MSps >> >> Symbol Rate: 25000.000000 >> Requested sps: 2.000000 >> Given sample rate: 250000.000000 >> Actual sps for rate: 10.000000 >> >> Requested sample rate: 50000.000000 >> Actual sample rate: 250000.000000 >> ok = False pktno = 53034 n_rcvd = 1 n_right = 0 >> ok = False pktno = 24 n_rcvd = 2 n_right = 0 >> ok = False pktno = 35 n_rcvd = 3 n_right = 0 >> ok = False pktno = 44 n_rcvd = 4 n_right = 0 >> ok = False pktno = 46 n_rcvd = 5 n_right = 0 >> ok = False pktno = 46 n_rcvd = 6 n_right = 0 >> ok = False pktno = 3872 n_rcvd = 7 n_right = 0 >> ok = False pktno = 12304 n_rcvd = 8 n_right = 0 >> ok = False pktno = 49 n_rcvd = 9 n_right = 0 >> ok = False pktno = 50 n_rcvd = 10 n_right = 0 >> ok = False pktno = 54 n_rcvd = 11 n_right = 0 >> ok = False pktno = 200 n_rcvd = 12 n_right = 0 >> ok = False pktno = 63 n_rcvd = 13 n_right = 0 >> >> Please suggest. Thank you >> >> Regards, >> Ravi >> >> -- >> Posted via http://www.ruby-forum.com/. >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > > _______________________________________________ > Discuss-gnuradio mailing > [email protected]https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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