Hi everyone,
We recently did VLBI observations centered at 1332.49 MHz, using a X310
with TwinRX. The USRP was locked to external references for 10MHz and
PPS for this. To get the best phase noise, I used 'integer-N' tuning. We
noticed that overall, our receiver frequency was off by 0.118 Hz.
Hi,
I'm trying to record the full X310 bandwidth, for a few hours, without
any missed samples. Which of course is a bit of a challenge - does
anyone here already achieve this?
We're using a TwinRX, so initially I wanted to record 2x 100MS/s (from
both channels), which amounts to 800MB/s, 6.4
ve got the
resampler part working.
Regards, Paul Boven.
On 28/02/2019 10:30, Paul Boven via USRP-users wrote:
Hi Jonathon,
Thanks for looking at the block, and spotting the mistake.
Unfortunately that doesn't stop the swig part from failing, so I'll keep
digging further.
Regards, P
you are a missing a comma:
LE($config 1) should be LE($config, 1). That may not be the source of
your issue, but try fixing that first.
Jonathon
On Thu, Feb 28, 2019 at 1:14 AM Paul Boven via USRP-users
mailto:usrp-users@lists.ettus.com>> wrote:
Hi everyone,
As part of the VLBI
Hi everyone,
As part of the VLBI[1] backend that I'm making in RFNOC, my first step
is to make a rational resampler. It takes the 100MS/s signal from a
TwinRX, and reduces it to 80MS/s. This can be done with a 5:4 resampler.
In order to make this work, I'm using the axi_rate_change block.
Al
Hi Jason,
I'm currently on the rfnoc-devel branch of uhd/host as well. And having
the same problem: Changing frequency on the DDC or radio causes hangs.
However, on 'master', the data format out of the rfnoc blocks didn't
even get accepted by the flowchart.
Could you please provide the detai
Hi Marcus, everyone,
On 25/11/2018 19:47, Marcus D. Leech via USRP-users wrote:
OK, just tried the attached flow-graph in the lab, using:
[mleech@lab ~]$ uhd_usrp_probe --args addr=192.168.10.2
[INFO] [UHD] linux; GNU C++ version 4.8.3 20140911 (Red Hat 4.8.3-7);
Boost_105400; UHD_4.0.0.rfnoc-
Hi again,
On 11/22/18 6:45 PM, Marcus D. Leech via USRP-users wrote:
Your radio block is set to a sample rate of 100e6, whereas the X310 uses
a sample clock of 200e6. This may be why things are getting
stuffed up.
I've now tried 200 MHz for the radio block. Still getting the same error
Hi,
On 22/11/2018 16:20, Marcus D. Leech via USRP-users wrote:
On 11/22/2018 09:26 AM, Paul Boven via USRP-users wrote:
A simple flowgraph (see attached image) using RFNOC:Radio, RFNOC:DDC
and a QT GUI frequency, together with Device3, starts and runs but no
data is produced. Instead, it
Hi everyone,
After quite a bit of trial and error, I've managed to build a GNU Radio
environment that includes RFNOC. My environment consists of:
uhd-3.14, gnuradio-3.7.13.4, gr-ettus (master).
uhd_usrp_probe shows that the X310 is detected, and has the expected
RFNOC blocks on board (DmaFIF
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