Dear Ali,
as you've noticed, the dB scale in digital samples just means "relative
to an arbitrary value", and not "relative to a milliwatt". I think
we've talked about that before?
So, in any reasonably constructed signal chain, distortion would start
to appear close to 0 dB Full-ADC-Scale. So all this is alright.
Best regards,
Marcus
On Thu, 2018-01-11 at 13:51 +0300, Ali wrote:
> Hi to all,
>
> I have an X310 USRP and a UBX-160 on it. There is also an antenna
> connected. I am transmistting some signal by a handheld radio and
> plotting the FFT plot of IQ data in GNURadio. It seems that power
> reaches almost 0dB. If I close too much the spectrum fluctuates, it
> does not look good. I think it saturates.
>
> When the peak at FFT Plot is -10 or -20 dB, the spectrum's shape is
> good. But the UBX is said to have max. input power of -15dBm which
> -45 dB. Do I give harm to my daughterboard in this case? I am
> confused. It does not look that I am harming.
>
> Best,
> Ali
>
>
>
>
> _______________________________________________
> 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
No comments:
Post a Comment