[Hackrf-dev] DVB-T and DVB-T2

[Craig Barber]

Hi Simon,

I've tried your script today with my test TV but see no signal whatsoever
on the TV although the hackrf is definitely transmitting. I've also tried
with a pre-recoded mpeg2 file from avconv but no luck.

Any suggestions?

Craig

On Tue, Jun 30, 2015 at 10:57 PM, Simon Kennedy <simon at thekennedys.info>
wrote:

> I feel slightly embarrassed as I subscribed to this list using an email
> address that is redirected to my main email, so consequently replies sent
> from my main email address were not coming from the correct address. Hence,
> none of the replies I posted have been seen on the list. Oops!
>
> Here is my reply about this thread:
>
> Hi Craig,
>
> Check out Clayton's web page (who created the sdr-examples you refer to)
> here <http://www.irrational.net/2014/03/02/digital-atv/>
>
> I amended his BladeRF script and I have put my HackRF version here
> <https://www.dropbox.com/s/bdnzoa0kn01dfav/dvbt-hackrf_tx_sk.py?dl=0> for
> download
> My version transmits DVB-T on the lowest Freeview channel in the UK at
> 474MHz (obviously only while using a dummy load). I successfully received
> the transmission of my webcam image this way using an RTL-SDR dongle.
>
> The command I used was very heavily influenced (ok, basically copied) from
> Clayton's examples:
> avconv -f alsa -i hw:0,0 -f video4linux2 -s 640x480 -i /dev/video0 -vf
> drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMonoBold.ttf:text="TEST
> ":x=440:y=420:fontsize=48:fontcolor=white at 0.6:box=1:boxcolor=black at 0.4
> -vcodec mpeg2video -r 60 -b 2000000 -acodec mp2 -ar 48000 -ab 48000 -ac 2
> -mpegts_transport_stream_id 1025 -mpegts_service_id 1 -mpegts_pmt_start_pid
> 4096 -mpegts_start_pid 400 -f mpegts -y in.fifo
>
> I used a standard web cam to capture the image, sent the output to a fifo
> file (in.fifo) and consumed the output through the python program with the
> command:
> ./dvbt_hackrf_tx_sk.py in.fifo
>
> The fifo file can be created using the command mkfifo in.fifo
>
> Run the avconv command and the python program in the same directory as you
> created the fifo file in.
>
> I have also transmitted DVB-S which I have documented on my blog here
> <http://photohamrad.blogspot.co.uk/2015/06/transmitting-video-with-hackrf-blue.html>
>
> Simon.
>
>
> On 30 June 2015 at 17:35, Simon Kennedy <simon at thekennedys.info> wrote:
>
>> Can you tell us the command you used to get this error please.
>> I remember that I got a smilar error but cannot look up how I solved it
>> until I get home in a couple of hours.
>> The key point is that the program is trying to open a UDP port to receive
>> the data and error relates to the asignment of the argument you supply to
>> the program to the variable 'port' in the program.
>>
>> Simon.
>>
>> On 30 June 2015 at 16:49, Craig Barber <radiocraig28 at gmail.com> wrote:
>>
>>> Here's the error I get:
>>>
>>> Traceback (most recent call last):
>>>   File "./dvbt-hackrf.py", line 123, in <module>
>>>     main(sys.argv[1:])
>>>   File "./dvbt-hackrf.py", line 31, in main
>>>     port    = int(args[0])
>>> ValueError: invalid literal for int() with base 10: 'testdvbt'
>>>
>>>
>>>
>>
>
> _______________________________________________
> HackRF-dev mailing list
> HackRF-dev at greatscottgadgets.com
> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist9.pair.net/pipermail/hackrf-dev/attachments/20150705/56368262/attachment.html>