Re: ETTUS N210 spurious

[Marcus D. Leech]

On 2022-01-18 11:15, Fabien PELLET wrote:
> Sampling rate has no effect as well as the amplitude of the baseband.
Then it may just be non-ideality in the DAC.  At -70dBc, it's unlikely 
to be digital in nature.


> Le 18/01/2022 à 16:45, Marcus D. Leech a écrit :
> > On 2022-01-18 10:01, Fabien PELLET wrote:
> > > Hello,
> > >
> > > When I put a signal generator that produces a sinwave at 1Khz and 
> > > that feeds an USRP Sink with a frequency center at 12MHz for 
> > > example, I got spurs at +/-32Khz, +/-64KHz and +/-96KHz at the 
> > > output of my N210 (used with LFTX and LFRX). Whatever the frequency 
> > > center of the USRP and the frequency of the baseband signal, I have 
> > > to spurs around -70dBc.
> > >
> > > Any idea on where it could come from ? Hardware EMC problem ? 
> > > Digital treatment issue ? How to solve it ?
> > >
> > > Best regards,
> > >
> > > Fabien, F4CTZ
> > What sample rate?  (Does that change things).   Also, if you reduce 
> > the baseband amplitude a bit, does that help?