Re: Issue with USRP N210

Hello Akram,

What kind of power levels do you expect, and why?

The observed power level depends on multiple factors,  including your environments, antennas, gain settings, and more. Also, USRPs are not calibrated spectrum analyzers and the numbers do not mean much (the numbers are relative to the dynamic ranges of the devices, and are not the absoute power levels).

By the way, please note that the peak that you are observing at 100 MHz is probably not a real FM station. It's probably a clock leakage.

Regards,

Kyeong Su Shin

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보낸 사람: whoppix_tn whoppix <whoppix.tn@gmail.com> 대신 Discuss-gnuradio <discuss-gnuradio-bounces+ksshin=postech.ac.kr@gnu.org>
보낸 날짜: 2020년 3월 30일 월요일 오전 1:09
받는 사람: Marcus D Leech <patchvonbraun@gmail.com>; christophe.seguinot@orange.fr <christophe.seguinot@orange.fr>
참조: Discuss-gnuradio@gnu.org <Discuss-gnuradio@gnu.org>
제목: Re: Issue with USRP N210

 

Thank you Marcus and Chris,

I figure out that indeed that the ports were not properly labeled. I've moved the antenna to the second RF and it gave a result:

However, I still see that the power is not that high (around -75dB). Is that normal?

Regards,

Akram

On Sun, Mar 29, 2020 at 4:38 PM Marcus D Leech <patchvonbraun@gmail.com> wrote:

Also what daughtercard are are you using?


Sent from my iPhone

> On Mar 29, 2020, at 8:10 AM, whoppix_tn whoppix <whoppix.tn@gmail.com> wrote:
>
> 
> Dear,
>
> I'm starting with USRP N210/Gnuradio, so my first exercise was to test it using uhd_fft. Here is the result I'm getting:
>
> uhd_fft --args "addr=192.168.10.2" -A RX2 -s 10e6 -g 10 -f 102e6
>
> <image.png>
>
>
> It seems to be that the result is not really as expected. In this FM band, I should see plenty of spikes which is not the case. Also, for the one that exists (100Mhz), the power is at -70dB which also seems too little to me. FYI, I'm using the clocktamer 1.2. I appreciate your support to make sure I have everything properly setup.
>
> Regards,
> Akram
>