On 2/8/19 4:45 AM, Mir Muhammad Lodro wrote:
> Hi,
> I am trying to create OOT using gr_modtool. It responds with the
> following output:
>
> mirlodro@mirlodro:~/prefix/default$ gr_modtool newmod howto
> Command 'gr_modtool' not found, but can be installed with:
>
> sudo apt install gnuradio
>
Alban,
It's absolutely critical that you use the -muxrate option in
ffmpeg. If you don't, you get a variable rate Transport Stream, which is
guaranteed to cause problems.
Also, I would specify the muxrate to 1 bps of accuracy. ffmpeg supports
it. So for 300 kSyms/s, it would be 276471.
Raydel,
You are correct on both points. QPSK (the only allowed
constellation in DVB-S) is 2 bits per symbol.
Ron
On 2/8/19 04:20, Raydel Abreu (CM2ESP) wrote:
Hi Ron
That formula it's very useful! Thanks. I have a silly question (sorry
for it). If I understand correctly 800 is the
hi thanks for your answers
my symbol rate is 300 ksps
using this calculator
http://www.satbroadcasts.com/DVB-S_Bitrate_and_Bandwidth_Calculator.html
and these settings : QPSK rate 1/2 FEC frame 64800
i get 276.5 kbps of TS bitrate
here are my settings for ffmpeg :
*ffmpeg -re -f lavfi -i
Hi Rensi,
You need to add an Embedded Python block to your flowgraph. That will allow
you to add whatever DSP code you want (such as squaring the signal) and
anything else (like printing it). Extracting data out of the block based
data flow is generally not the recommended way of handling data.
Hi,
I am trying to create OOT using gr_modtool. It responds with the following
output:
mirlodro@mirlodro:~/prefix/default$ gr_modtool newmod howto
Command 'gr_modtool' not found, but can be installed with:
sudo apt install gnuradio
I have installed fresh copy of the GNU Radio using PyBombs.
Hi Ron
That formula it's very useful! Thanks. I have a silly question (sorry for
it). If I understand correctly 800 is the symbol rate and 12901961 is
the TS rate? Correct?
The multiply by 2 is because Tx signal is QPSK? If that's so then it will
be 1 for BPSK, 3 for 8PSK and so on Am I
