[USRP-users] Random long duration noise at the start of UBX captures

Michael West michael.west at ettus.com
Mon Oct 12 16:51:29 EDT 2015


To be clear, when I say disconnect the GPSDO, I mean disconnect the GPSDO
power.  The data cables can be left in place.

Regards,
Michael

On Mon, Oct 12, 2015 at 1:43 PM, Michael West <michael.west at ettus.com>
wrote:

> Hi Nathan,
>
> The simple answer is no, that is not expected.  What do you have connected
> to the RX2 port?  Also, do you see the same effect if you disconnect the
> GPSDO?
>
> Regards,
> Michael
>
> On Mon, Oct 12, 2015 at 1:26 PM, Perelman, Nathan via USRP-users <
> usrp-users at lists.ettus.com> wrote:
>
>> I’ve been having issues with UBX daughter-boards for a little while, and
>> I finally traced them down to a reproducible issue. Running:
>>
>> ./rx_samples_to_file --duration 2 --rate 25000000 --freq 1e9 --gain 38
>> --ref gpsdo --setup 0
>>
>>
>>
>> I frequently see large amounts of random noise (up to +/- 0.5 out of
>> 1.0), for up to 0.5 seconds. I have tested with 2 different UBX
>> daughter-boards and seen similar noise. Is this expected with the UBX? I do
>> not see similar noise with the SBX.
>>
>>
>>
>> I am using UHD 3.8.5 with an N210.
>>
>> -Nathan
>>
>> _______________________________________________
>> 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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