[opendtv] Re: Create DVB-T RF with your VGA card
- From: Adam Steinberg <adam@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 21 Jun 2005 10:20:19 -0700
Hell, I'd even pay some money for a low cost 8VSB signal generator like
that.
Adam
--
Adam Steinberg
Director, Product Line Management
Elgato Systems LLC
900 Kearny Street Suite 750 San Francisco, CA 94133-5145
T 415/391-0310 x235 F 415/391-0329 www.elgato.com
On 6/21/05 9:57 AM, "John Shutt" <shuttj@xxxxxxxxx> wrote:
> Any takers on the 8-VSB hack?
>
> John
>
> <http://www.tvtechnology.com/dlrf/one.php?id=910>
>
> Don Lung's RF Report
>
> Use Your PC VGA Card to Generate DVB-T RF
>
> Although I haven't been able to verify this actually works, I thought
> readers would be interested in a Web site describing how to use a PC running
> Linux and a current generation video card to create a modulator capable of
> generating a VHF DVB-T signal. At present, the system does have some
> limitations. It can only transmit still images and the DVB-T signal
> containing the images has to be computed separately before it is sent to the
> VGA adapter.
>
> If you are interested in trying out this modulator, you will need a PC with
> a recent VGA card able to display resolutions up to 4096x2048 using 8 bits
> per pixel with a pixel clock of exactly 76.5 MHz. The ATI Radeon 9200SE
> cards are reported to work, according to the Web site. The video card's red
> digital to analog converter output (signal pin 1 and ground pin 6 on a
> standard 15 pin VGA connector) is used as the RF output. The output power is
> very low so you will likely need to make a cable to feed the RF to the TV
> set.
>
> The DVB-T modulator also requires use of Linux and the X Window system on
> the PC. The X Window server allows custom configuration of the video card's
> output signal. Using precompiled files from the Web site, you can generate a
> valid 16-QAM DVB-T COFDM-2K output signal receivable on channel 5 (178.75
> MHz) with two channels, each with a still picture.
>
> For details on this interesting experiment, files, and additional links, see
> Use your VGA Card to Transmit DVB-T signals! A Low Cost Analog and Digital
> TV (DVB-T) Modulator. <http://fabrice.bellard.free.fr/dvbt/>
>
> Who will be the first to use similar techniques to generate an 8-VSB signal
> on a U.S. TV channel using a video card? As the 8-VSB signal is less complex
> than the COFDM signal, it seems this wouldn't be too difficult! If you
> succeed, please let me know! As we make the transition to digital TV, there
> will be a need for low-cost test equipment and ideas like this that
> challenge engineers to learn more about DTV transmission.
>
>
>
>
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