Re: ETTUS N210 spurious

[Fabien PELLET]

Hello,

Here is the flowgraph. I see the spurs on an HP8563E with RBW at 30Hz 
and span at 200Khz. I remember that it could be related to my spectrum 
analyser : I will investigate in that direction before. But if someone 
could make the test, it could be interesting. I use a N210 with LFTX and 
LFRX.

-70dBc could be nothing for digital transmission but in analog use case, 
as near as it is from the signal, -70dBc is not so good. For station 
closed to that TX, it will be heard especially in HF usage.

Best regards,

Fabien, F4CTZ.

Le 01/02/2022 à 17:01, Marcus D. Leech a écrit :
> On 2022-02-01 06:35, Fabien PELLET wrote:
> > Hello,
> >
> > Thanks for the reply. As I wrote, I try several sampling rate on the 
> > baseband I provide to the USRP without any effects on that spurs so 
> > it is not related to the sampling rate. I just put a signal source 
> > that feeds the USRP sink for that test.
> >
> > It should be EMC related, as far as I understand reading all answer 
> > on that mailing list.
> >
> > Thanks,
> >
> > Best regards,
> >
> > Fabien, F4CTZ.
> Could you share the exact flow-graph you're using?
>
> Also, a spur at -70dBc can usually be ignored in any practical system 
> -- it's 10,000,000 times weaker than the carrier.

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