Hi John, trying to understand the confusion here:
What I recommended was really the two-block solution you mentioned in GRC: Noise-to-air flow graph So, wouldn't that be exactly what you need? A samp_rate wide piece of white-as-it-gets noise anywhere the E310 can tune to? Best regards, Marcus On 03/23/2017 02:34 PM, John B. Wood wrote: > On 01/05/2017 02:22 PM, Marcus Müller wrote: >> Hi John, >> >> sure! Just use the noise source with a noise variance (amplitude) low >> enough to allow for the resulting amplitude to very rarely exceed 1.0 >> (because that would lead to artifacts/non-gaussian distribution) (or, >> better yet, use the fast noise source, which preallocates a definable >> amount of noise that it then plays over and over again), and connect it >> to the USRP sink. >> >> Notice that the E310 isn't sold calibrated – you'll need to calibrate >> the noise power generated using e.g. a calibrated spectrum analyzer >> yourself. >> >> Best regards, >> >> Marcus >> >> >> On 01/05/2017 08:18 PM, John B. Wood wrote: >>> Hello, all. This may be a "RTFM" question but with the stock tools in >>> GRC (or a non-GRC generated .py file) can a gaussian white noise >>> generator be readily implemented on an Ettus E310 to provide a >>> broadband RF noise output (some level in dBW/Hz) over a specified >>> bandwidth (within the capabilities of the E310) that can be used to >>> evaluate noise performance of radio receivers? If not feasible then I >>> will probably have to purchase a noise generator. Thanks for your time >>> and comment. Sincerely, >>> >>> >>> J. Wood >>> U.S. Naval Research >>> Laboratory >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > Hello, Marcus and all. I finally got around to trying to implement > the above suggestion on an Ettus E310 but am a bit puzzled. The > suggestion is to connect the GRC noise gen block to a USRP sink. What > I want to accomplish is to use the E310 (USRP source?) to output white > noise over a prescribed frequency band (e.g. 1-2 GHz) such that an > E310 transmit antenna port could be then connected to the device > under test (DUT) for noise figure determination. Seems like a simple > two-block GRC flow graph. Thanks for any clarification. Sincerely, > > > J. Wood > U.S. Naval Research Lab > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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