Hello All,
I am trying to transmit on two UBX-160 daughterboards within a single X310
at 200 Msps using UHD 4.1.0.5-3.
I am experiencing periodic underflows, and I have already applied all of
the tips in the "USRP Host Performance Tuning Tips and Tricks" application
note, with the exception of u
Hello everyone,
I am using an X310 with a UBX-160 daughter card to playback many hours of
recorded samples.
After a few hours, even when using a very powerful server, some underflows
accumulate. This impacts the timing of data being played back. In some
cases a 24 hour playback will accumulate 10
Hello,
I am trying to understand the spec for the Ettus TCXO for the B200, and for
GPSDOs in general.
The performance when the oscillator is unlocked is clearly stated as 75
ppb. The spec says this deviation is primary driven by temperature
(Frequency Stability Over Temperature = +/- 7.5e-8)
Wha
via USRP-users <
usrp-users@lists.ettus.com> wrote:
> On 07/27/2020 09:05 PM, Aaron Smith via USRP-users wrote:
>
> Hello all,
>
> I am trying to output a sine wave from a B200 using custom code, or the
> UHD tx_waveform example. In either case, when I view the output on an
&
Hello all,
I am trying to output a sine wave from a B200 using custom code, or the UHD
tx_waveform example. In either case, when I view the output on an o-scope,
there is not a pure sine wave. The output looks more triangular wave. I
have used this scope with other B200s and the same code to get a
3, 2020 at 1:27 PM Marcus D. Leech
wrote:
> On 06/23/2020 03:18 PM, Aaron Smith wrote:
>
> Marcus,
>
> They are EndRun Meridian and Meridian II units.
>
> I am very ignorant on this topic. Is it a standard that the 1 PPS should
> coincide with the top of a 10 MHz cycle?
se. I don't understand how the 10 MHz reference and 1 PPS
input are used to synthesize time. Is the 1 PPS detection done at the
master lock rate (200 MHz) or at 10 MHz?
On Tue, Jun 23, 2020 at 1:06 PM Marcus D. Leech via USRP-users <
usrp-users@lists.ettus.com> wrote:
> On 06/23/2
Hello,
I am attempting to release a transmission from an X310 every second. To
accomplish this, I must measure, and calibrate the delay in the RF front
end of the radio for my chosen sample rate. I'd like the transmission to be
released within 1 clock cycle of the rising edge of the PPS.
I am fee
I pulled down the master branch of UHD about 2 months ago.
My version is 3.15.0.HEAD-0-gaea0e2de.
On Mon, Jun 15, 2020, 4:54 PM Marcus D. Leech
wrote:
> On 06/15/2020 06:51 PM, Aaron Smith wrote:
>
> Yes, transmissions within the same session are consistent. If I destroy
> the Mult
, Jun 15, 2020, 4:47 PM Marcus D. Leech
wrote:
> On 06/15/2020 06:45 PM, Aaron Smith wrote:
>
> I am using a master clock rate of 48 MHz and a sample rate of 8 MHz.
>
> When do you notice the timing inconsistency? For example, if you do a
> number of timed transmits during the
I am using a master clock rate of 48 MHz and a sample rate of 8 MHz.
On Mon, Jun 15, 2020, 4:41 PM Marcus D. Leech
wrote:
> On 06/15/2020 03:42 PM, Aaron Smith wrote:
> > I am using the python api.
> >
> > usrp = uhd.usrp.MultiUSRP()
> >
> > # Set
think I need more information on what you’re doing.
>
> Are you starting a timed transmit sequence on both B200 and seeing a
> timing difference between the two?
>
> More details on your exact setup will help us all help you.
>
> Sent from my iPhone
>
> On Jun 15, 2020, at 1:09
to resolve the random delay?
Thanks,
Aaron
On Fri, Jun 12, 2020 at 8:19 PM Marcus D. Leech via USRP-users <
usrp-users@lists.ettus.com> wrote:
> On 06/12/2020 10:07 PM, Aaron Smith via USRP-users wrote:
>
> Robin - with your insight I see that other users have addressed this on
>
> dividers randomly introduce a 0-degree or 180-degree phase shift when they
> come up.
>
>
>
> On Fri, Jun 12, 2020 at 4:08 PM Aaron Smith via USRP-users <
> usrp-users@lists.ettus.com> wrote:
>
>> All of the devices share a 10 MHz reference that is generated from
t
> there's an extra flop in the logic for the PPS timing chain somewhere -- as
> in, the clock starts ticking on the first tick after PPS comes in. I've
> made that error about half a million times, myself.
>
> Nick
>
> On Fri, Jun 12, 2020 at 2:23 PM Aaron Smith via U
Hello all,
I have two separate, but related, questions.
I am trying to trigger an RF transmission every second, and I am receiving
the transmission with a receiver that has very precise time stamps. I am
driving the receiver with the same 1 PPS source as the B200 and N210. For
my simple test, I w
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