Hi,
I am new to using GNU Radio and was going through some examples provided
with the source code I checked out from the master branch. However, I find
that one of the variables named "source_file" is not defined in the
benchmark_tx.py example found in gnuradio/gr-digital/examples/ofdm
directory.
Hello,
I am a new GNU Radio user. I am looking to build a system that can transmit
a packet at a pre-defined time with very high accuracy (about 1
nanosecond). Having gone through the mailing list I am aware that timed
transmission is a common task and many people have asked similar questions.
How
Hi Martin,
Appreciate your reply to my questions. I agree that I cannot do better than
a clock cycle, so that is settled. Let us say that I use GPSDO for my
reference and I wish to transmit at GPS time t. Is it possible to control
the transmit time to within (t plus/minus 1 clock cycle)? I have re
Thanks Usman, That was some really useful information. So if this is the
case then I should be able to calibrate out both the DSP and analog delay
(analog delays are supposed to be smaller and stable).
Also, a DAC delay must also be included in those calculations.
Best,
Lakshay.
Hi Martin,
>
> A
here*
> *was no tracking etc. required.*
>
> *M*
>
> *On 07/13/2016 09:24 AM, Lakshay Narula wrote:*
> >* Hi Martin,*
> >
> >* Appreciate your reply to my questions. I agree that I cannot do better*
> >* than a clock cycle, so that is settled. Let us say that I us
Hello all,
I have been trying to understand the mechanics of stream tags and USRP. To
this end, I am reading through the tags_demo.cc example found in
gr-uhd/examples/c++.
The example provides two options for burst control: using SOB/EOB tags, and
using tagged stream blocks. For clarity, let us a
Thanks Martin, that was exactly what I was looking for.
Would the following statement be correct: the GNU Radio flowgraph always
produces samples as fast as the CPU can (irrespective of the set sample
rate or throttle), and stops producing whenever the USRP sink buffer is
full.
Also, does the thr
Alright. Thanks for your help Martin.
-Lakshay.
On Fri, Jul 22, 2016 at 8:51 PM, Martin Braun
wrote:
> On 07/22/2016 04:38 PM, Lakshay Narula wrote:
> > Thanks Martin, that was exactly what I was looking for.
> >
> > Would the following statement be correct: the GNU R
That was great information Marcus, appreciate it!
Thanks,
Lakshay.
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Hello,
I am trying to use the "tx_time" tag in my Python OOT block. The value
for this tag is a tuple of PMTs: integer seconds in PMT format derived
from uint64_t, and fractional seconds in PMT format derived from double.
These data type conversions work well in C++. But in Python there are n
the SWIG file, but
I have not found an answer yet.
Thanks,
Lakshay.
On Sun, Aug 14, 2016 at 2:24 PM, Marcus Müller
wrote:
> Hi Lakshay,
>
> haven't tried that in a while; but wouldn't from_long() work?
>
>
> Best regards,
> Marcus
>
>
> On 12.08.201
bine the full and fractional seconds
> into a floating number.
>
> There's a couple of workarounds, of which I prefer the following
>
> time_now = usrp_source_0.get_time_now()
> frac_seconds = time_now.get_frack_secs()
> full_seconds = time_now.to_ticks(1.0)
>
> B
Hello all,
I have been trying to perform ranging between nodes using time-of-arrival
of signals. To this end, I am trying to transmit an accurately timed pulse
using the USRP. My initial experiment simply sends out a 100 ms burst every
1 sec. I am then recording this signal using NI PXIe-5663 fron
mple rate, then let that repeat. I'm getting nice, clean rising edges on
> my pulses (run into an oscilloscope). Maybe the first pulse is distorted,
> but once the filters have been filled up, everything should be clean.
> Lou
>
>
>
> Lakshay Narula wrote
> > Hello a
Hello,
I am seeing something interesting with my E310 when I try to use an
external PPS on the SYNC connector. Here is what I am trying to do: Lock
the internal reference clock to external PPS and generate a burst output
every second using tx_time tags. Feed this output to an oscilloscope, where
I
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