Re: [Discuss-gnuradio] USRP S-Band RX

From:

Justin Shetty

Subject:

Date:

Tue, 17 Jul 2018 14:49:33 -0400

I've tried the same test again with 30db and 60db of attenuation. The average strength is lower but the FFT still has the same profile with the repeated spurs. The RX overloading theory seemed promising, but I'm not sure what to make of the situation now that attenuation had little effect.

On Tue, Jul 17, 2018 at 2:43 PM Justin Shetty <address@hidden> wrote:

Looks the same as with my flowgraph (which is just the USRP source going straight to the constellation and fft sinks). Also for reference I'm using the SBX daughterboard.

On Tue, Jul 17, 2018 at 1:13 PM Marcus D. Leech <address@hidden> wrote:

On 07/16/2018 05:29 PM, Justin Shetty 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

What happens if you just use the "uhd_fft" utility to view this, rather than your own code?

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio