[USRP-users] problem with USRP example on X310 with CBX-120

Michael West michael.west at ettus.com
Mon Oct 27 13:32:50 EDT 2014


The patch should work for any version of UHD from 3.7.0 forward.

Michael

On Mon, Oct 27, 2014 at 7:48 AM, Jim Hunziker <jhunziker at bcisensors.com>
wrote:

> Thanks. It looks like this patch isn't against 3.7.3. We're not running
> against the master branch right now. Is this patch intended for 3.8-rc?
>
>
> --
> Jim Hunziker
> BCI Systems and Software Engineering
> (973) 348-9299
> jhunziker at bcisensors.com
>
> On Fri, Oct 24, 2014 at 5:55 PM, Michael West <michael.west at ettus.com>
> wrote:
>
>> Hi Jim,
>>
>> An experimental UHD patch was sent to your colleague to address the
>> calibration issue.  Please let me know if you need the patch sent to you
>> directly and I will get it to you.
>>
>> Best regards,
>> Michael
>>
>> On Thu, Oct 23, 2014 at 10:40 AM, Jim Hunziker via USRP-users <
>> usrp-users at lists.ettus.com> wrote:
>>
>>> Marcus Leech responded to me off-list that I was using gain settings
>>> that were too low. Setting them to 10 greatly improved my signal, though
>>> there's still a carrier component that's bigger than my signal and not
>>> getting removed. A colleague tells me he's working with Ettus regarding
>>> this problem.
>>>
>>>
>>> --
>>> Jim Hunziker
>>> BCI Systems and Software Engineering
>>> (973) 348-9299
>>> jhunziker at bcisensors.com
>>>
>>> On Wed, Oct 22, 2014 at 4:42 PM, Jim Hunziker <jhunziker at bcisensors.com>
>>> wrote:
>>>
>>>> It looks like some of my problem was plotting abs(sig_c) rather than
>>>> real(sig_c), but the signal still doesn't look great.
>>>>
>>>>
>>>> --
>>>> Jim Hunziker
>>>> BCI Systems and Software Engineering
>>>> (973) 348-9299
>>>> jhunziker at bcisensors.com
>>>>
>>>> On Wed, Oct 22, 2014 at 12:15 PM, Jim Hunziker <
>>>> jhunziker at bcisensors.com> wrote:
>>>>
>>>>> Hi. I have an X310 with a CBX-120 and a GPSDO, and I'm running the
>>>>> txrx_loopback_to_file example with UHD version 3.7.3 like this:
>>>>>
>>>>> ./txrx_loopback_to_file --tx-args addr=10.10.10.90 --nsamps=250000
>>>>> --tx-rate 2500000 --rx-rate 2500000 --tx-freq 56000000
>>>>> 00 --rx-freq 5600000000 --rx-ant CAL --wave-type SINE --ref internal
>>>>> --wave-freq 1000
>>>>>
>>>>> (It makes no difference if I use the RX2 antenna and a loopback cable.)
>>>>>
>>>>> With a sampling rate of 2.5 MHz and a sine wave of 1 KHz, I expect to
>>>>> see a sinusoidal cycle every 2500 samples. I'm plotting them with GNU
>>>>> Octave and the following commands:
>>>>>
>>>>> fid = fopen("~/uhd/host/build/examples/usrp_samples.dat", "rb");
>>>>> [sig, count] = fread(fid, Inf, "int16");
>>>>> sig_c = sig(1:2:end) + j * sig(2:2:end);
>>>>> plot(abs(sig_c));
>>>>>
>>>>> The signal seems very noisy, and it's pretty much gone towards the end
>>>>> of the capture. Am I doing something wrong?
>>>>>
>>>>> --
>>>>> Jim Hunziker
>>>>> BCI Systems and Software Engineering
>>>>> jhunziker at bcisensors.com
>>>>>
>>>>
>>>>
>>>
>>> _______________________________________________
>>> 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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