Re: DVB-T transmit question

[Ron Economos]

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