[USRP-users] TwinRx transfert function

Marcus D. Leech patchvonbraun at gmail.com
Fri Nov 8 10:55:26 EST 2019


On 11/08/2019 03:56 AM, Olivier Ravard via USRP-users wrote:
>
> Hello,
>
> Is there anyone to answer this question ? Did someone experience the 
> same 4dB fluctuations
> in the 80 MHz bandwidth for acquisitions with TwinRx ?
>
> thanks
>
Two questions:

    o how was the spectrum captured (in the software sense)
    o could you share the output of "uhd_usrp_probe" with us (that will 
tell us which version of TwinRX hardware you have, etc)


> Olivier
> Le 06/11/2019 à 12:31, Olivier Ravard via USRP-users a écrit :
>>
>> Hello,
>>
>> We use X300 with 2 TwinRx boards for acquisitions in L band (UHD 3.10.3).
>>
>> It seems that the transfert function of the couple (X300 - TwinRx) 
>> shows strong fluctuations.
>> To measure these fluctuations, we put a white noise generator at the 
>> input (this generator was
>> measured before with a spectrum analyser and it show a very flat 
>> transfert function over 1 GHz)
>> and we measure the PSD of the sampled 80MHz bw signal for the 4 inputs.
>>
>> The result is shown on figures below:
>>
>> inputs 1 and 2 (first TwinRx):
>>
>> inputs 3 and 4 (second TwinRx):
>>
>> Are these fluctuations normal ?
>>
>> regards,
>>
>> -- 
>> Olivier
>>
>> _______________________________________________
>> USRP-users mailing list
>> USRP-users at lists.ettus.com
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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