On 07/20/2016 10:15 AM, avinash kalyanaraman wrote:
Thanks Marcus.
A quick follow-up question:
Should the length of my ethernet cables (to the GigE switch from each
of the USRPs that I am trying to synchronize) match so that I get
time-aligned I/Q samples ?
Thanks!
No, this is not something you need to worry about. If your packets of
samples entered the cables time-aligned, they will also leave the cables
time-aligned, regardless of any length differences in the cables.
The same cannot be said on the analog side of things.
On Mon, Jul 18, 2016 at 12:20 PM, Marcus Müller
<[email protected] <mailto:[email protected]>> wrote:
They always align at the beginning. The file size difference is
really just because due to the nature of general purpose hardware
and GNU Radio's scheduling, there's no guarantee all blocks have
written the same amount of data when you kill the flow graph.
Am 18. Juli 2016 17:46:13 MESZ, schrieb avinash kalyanaraman
<[email protected] <mailto:[email protected]>>:
Thanks Martin.
Is there any particular reason why I see different file sizes
for the former (file-sink) case? I ctrl+c the hand edited
python file to stop sample collection. The file sinks are
unbuffered. Since they are of different sizes, is there a way
to know which samples align in time ?
Thanks!
On Fri, Jul 15, 2016 at 5:30 PM, Martin Braun
<[email protected] <mailto:[email protected]>> wrote:
This'll work. However, the uhd_rx_cfile utility that comes
with GNU
Radio will do that for you.
Cheers,
M
On 07/15/2016 11:33 AM, avinash kalyanaraman wrote:
> Hi all,
>
> I want to analyze the I/Q samples of 3 synchronized
USRPs (connected to
> an Octoclock G). I have synchronized the USRPs according to
> http://files.ettus.com/manual/page_sync.html (i.e. I
hand-modified the
> python file generated by GRC).
>
> I am feeding the output of my USRP Source block (with 3
channels and 3
> motherboards) to three file sink blocks. Would this be
enough to save my
> synchronized I/Q samples ?
>
> I notice that the size of the three files (storing the
I/Q samples)
> aren't the same after my run.
>
> Attached is also a screenshot of the GRC file.
>
> Thanks!
>
> --
> Avinash
>
>
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