Seems fine here. Can you try the unmodified example flow graph? The
example Transport Stream can be downloaded here:
https://www.w6rz.net/adv8dvbt23qam64.ts
Also, which version of GNU Radio are you using?
Ron
On 1/30/22 08:40, Szilassi Andras wrote:
Hello,
I am currently working on a dvb-t remodulator for our passive radar at
my university.
With the available example IQ file, I was able to get the receiving
example program running, but I ran into some problems with the
transmit example.
When I run a .ts mpeg stream through the example, for some reason in
the place where the cyclic prefix should appear, the output is
constant zero.
The reason I think that something is wrong with the prefixing is that
the output signal is periodic in the time domain ( for around ~ 200 us
there is no signal, then for ~ 800 us there is and so on). The CP
length is set at 1/4 so that confirms that.
I dont have enough in-depth knowledge yet to find the answer in the
source files, so if anyone could help me I would really appreciate it.
Thanks is advance,
András
Technical University of Budapest
