On Tue, Jan 7, 2014 at 7:11 PM, Marcus D. Leech <[email protected]> wrote:
> > Try reducing the amplitude to 0.7. Another possibility is that your > computer can't keep up. If you are using one of the standard programs, are > there U's printing in the terminal? > > Matt > > Also, what RF gain are you setting? Does it exceed the maximum input > level of the spectrum analyser? > > Are you connected directly, or with an antenna? > > > > On Tue, Jan 7, 2014 at 3:03 PM, Jonathan Fox > <[email protected]>wrote: > >> A colleague and I are sending a simple signal in GNU Radio (sine wave, >> 1 MHz, amplitude of 1) to the USRP sink and have the center frequency at >> 500 MHz. The N210 USRP is hooked up to an Agilent spectrum analyzer. On the >> analyzer we are seeing a weird phenomena every two seconds. At first we see >> the carrier frequency and two sidebands from the sine wave (see attached >> normal.gif). Then after two seconds we get two bursts of multiple harmonics >> (see odd.gif). >> >> The question is, why is this happening? Does the phase of the 1 >> KHz signal become discontinuous before or after being sent to the USRP? >> >> Thanks, >> >> Jon Fox >> >> _______________________________________________ >> USRP-users mailing list >> [email protected] >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> > > _______________________________________________ > Discuss-gnuradio mailing > [email protected]https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortiumhttp://www.sbrac.org > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > I don't recall seeing any U's but I can recheck tomorrow. The gain on the USRP was set to -2. The USRP was connected directly with an SMA cable. The analyzer is an Agilent E4440A, the Analyzer is rated for at least 1 Watt on average, 100 Watt on a peak pulse (with the built-in attenuator in use). While I am not ruling out the maximum input I thought the N210 tops out at 0.5 Watts due to FCC regulations. Thanks Jon
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