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Re: [Discuss-gnuradio] USRP S-Band RX
From: |
CEL |
Subject: |
Re: [Discuss-gnuradio] USRP S-Band RX |
Date: |
Tue, 17 Jul 2018 12:15:12 +0000 |
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 <address@hidden> 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 <address@hidden> 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
> > > address@hidden
> > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
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- [Discuss-gnuradio] USRP S-Band RX, Justin Shetty, 2018/07/16
- Re: [Discuss-gnuradio] USRP S-Band RX, Marcus D. Leech, 2018/07/16
- Re: [Discuss-gnuradio] USRP S-Band RX, Marcus D. Leech, 2018/07/17
- Re: [Discuss-gnuradio] USRP S-Band RX, Justin Shetty, 2018/07/17
- Re: [Discuss-gnuradio] USRP S-Band RX, Justin Shetty, 2018/07/17
- Re: [Discuss-gnuradio] USRP S-Band RX, CEL, 2018/07/17
- Re: [Discuss-gnuradio] USRP S-Band RX, Marcus D. Leech, 2018/07/17
- Re: [Discuss-gnuradio] USRP S-Band RX, Justin Shetty, 2018/07/17
- Re: [Discuss-gnuradio] USRP S-Band RX, Marcus D. Leech, 2018/07/17
- Re: [Discuss-gnuradio] USRP S-Band RX, Justin Shetty, 2018/07/17
- Re: [Discuss-gnuradio] USRP S-Band RX, Marcus D. Leech, 2018/07/17