Hi,
I'm using three audio cards in my flow graph. The internal and a USB audio
cards run at 96 kHz and I use a virtual audio card with 5 subdevices
loading the snd_aloop kernel module that runs at 48 kHz.
I've noticed that after some days of running there seems to be a delay
(around 1 second) pro
Hi Jason,
I shouldn't have hit the send button yesterday and went to bed right after.
Had a night of bad sleep; I realized my formulas only applied to the
case of real valued signals.
Your dongles won't be giving you cosines in complex baseband for a
signal they see at $f_\text{offset}$;
they will
After finding this some of the sample rates make more sense:
> The sample rates are dictated by the RTL2832U chip, not the tuner chip.
> The RTL2832U can sample from two ranges ...
> 225001 to 30 and 91 to 320.
> Pick any number that lies in either of those two ranges.
> (http://forums
Hello!
Wondering if anyone can comment on this error. I'm running Ubuntu 14.04 which I
installed gnuradio using apt. The problem that I see is that it's looking for
gnuradio version 3.7.2. This is the version that got installed when I used apt
to install. Do I need to provide a path name back
Thanks Marcus, that helps a lot.
Since I have to multiply the resulting offsets against each other, that
means I will need to run a splitter from my sig-gen to the two dongles.
Is there any concern that non-linearities in the two legs of the
splitter would effect the results?
Also, what should
Hi Jason,
now to comments to your comments:
On 12.01.2016 18:43, Jason Matusiak wrote:
> Thanks for the quick response Marcus
>
> Since my Latex isn't very good (as in pretty much non-existent). Let me
> see if I can rewrite what you recommended in my dumbed down language and
> see if I am clo
Oh, sorry, I forgot to hit the "replace LaTeX by rendered formulas"; let
me re-do that, before I comment on your comments :)
Capture the same reference tone at $f_\text{ref}$ with both dongles,
tuned to $f_\text{tune} = f_\text{ref}-f_\text{offset}$, choose
$f_\text{offset}\approx \frac{f_\text{sa
Thanks for the quick response Marcus
Since my Latex isn't very good (as in pretty much non-existent). Let me
see if I can rewrite what you recommended in my dumbed down language and
see if I am close.:
*I have two dongles, dongle 1 will be my modified dongle, dongle 2 will
be my un-modified d
Marcus Müller-3 wrote
> So: you'll really have to define a maximum time that a GPIO toggle may
> stay undetected. This shouldn't be hard -- I mean, in the end, there's
> some application's needs that you'll want to satisfy.
Is it a way to suggest me to use a sleep instruction during the poll loop?
Also, in [1] authors claim a version of gr-ieee802-11 that is
CSMA-CA-capable on N210
(i think you have to switch from master to the agc_and_csma branch in [2]).
However the solution does not implement ACKs i.e. it is suitable only for
WiFi broadcast
communications as is the case of some 802.11p s
Well, if you implement a lot of the IEEE802.11 in the FPGA, yes, that
could work. But: then it would hardly be a GNU Radio implementation.
Also, please don't expect the poor CPU of the E310 to process 20MHz of
bandwidth itself; it's a power-efficient ARM, and you'll need a
relatively new PC CPU to
Hi thank you for the reply.
I have acces to the USRP E310, is it posible that this hardware will
support the correct timings using the RFNoC?
2016-01-08 12:59 GMT-05:00 Saulo Queiroz :
> Hi Gabriel,
> No. In most of boards, the delay between PC and device turns unfeasible
> the work of critical t
Hi Pedro,
$y[n]=\sum\limits_{i=n-N+1}^n {\left|x[i]\right|^2}$ is nothing but the
moving average over the squared magnitude.
Sadly, your formula
$T=\sum\limits_{n=0}^{N-1} {\left|Y[n]\right|^2}$ doesn't specify what T
signifies; is T used as a single sum over N samples' squared magnitudes,
or is i
Dear all,
In addition to my previous response, I'm attaching an image that shows the
formula I'm trying to build in gnuradio (using blocks). But instead of n =
0 and N-1, I need n = 1 and 100 (100 samples). The second picture shows how
I tried to do in Gnuradio, but the moving average block does n
Capture the same reference tone at $f_\text{ref}$ with both dongles,
tuned to $f_\text{tune} = f_\text{ref}-f_\text{offset}$, choose
$f_\text{offset}\approx \frac{f_\text{sample}}3$.
You would see a baseband tone at $f_{\text{offset},1}$ and
$f_{\text{offset},2}$, respectively, and since no two osc
I have a handful of the NooElec blue USB DVB-T receivers that we
occasionally use at work. I managed to get a hold of a TCXO to replace
the crystal on the board for an attempt at better accuracy (with less
drift).
The dongle seems to be functioning fine (so I know that the oscillator
is functioni
hello tom,
i tried to put a block of packing bits after FEC decoder block but still
received data is not same as transmitted. here i am working in simulation
environment not on air so i think there will not be any delay problems.
Hitesh
On Mon, Jan 11, 2016 at 10:54 PM, Tom Rondeau wrote:
> On
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