The equidistant spurs do really indicate RX overloading. Overloading lead to the amplifier being non-linear. Non-linearity leads to intermodulation, intermodulation leads to equidistant spurs.
Please add attenuation; you don't want to damage your receiver, right? Best regards, Marcus On Mon, 2018-07-16 at 21:16 -0400, Justin Shetty wrote: > This is through a cable, but without the amplifier activated. It looks > identical over the air though. > > On Mon, Jul 16, 2018 at 5:57 PM Marcus D. Leech <mle...@ripnet.com> wrote: > > My guess would be that the RX is ovkerloaded. Is this via cable? If so do > > you have plenty of attenuation inline? > > > > Sent from my iPhone > > > > On Jul 16, 2018, at 5:29 PM, Justin Shetty <jas0...@gmail.com> wrote: > > > > > Hi all, > > > > > > I am working with an s-band radio and am receiving its OQPSK-modulated > > > signal on an USRP N210. The signal I'm seeing on an FFT and constellation > > > plot before any processing are not as expected though. It is very > > > different from the example shown in the GNU Radio tutorial 7 (random > > > source to a constellation modulator to a channel model). I also looked at > > > the signal on a spectrum analyzer and it did not show the repeated peaks > > > I am seeing on my FFT. Does anyone know where I might be going wrong or > > > what's happening? > > > > > > Justin Shetty > > > > > > <fft_and_constellation.PNG> > > > _______________________________________________ > > > Discuss-gnuradio mailing list > > > Discuss-gnuradio@gnu.org > > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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