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<P><FONT face=Verdana>The Future of Amateur Television is Digital.<BR><BR>It is
a fact nowadays that our spectrum becomes overloaded. ATV is a very popular
transmission mode and the 23cm band is currently a typical example where a lot
of users exist in a relative small frequency segment. Besides that we as
amateurs all feel the need to transmit a signal that is as perfect as possible.
We are already experiencing this with the extensive usage of digital audio
transmission standards like NICAM or PCM. Wouldn't it be great if we can use a
digital transmission standard for our video signals?<BR><BR>That is now
possible. We have developed a digital television transmitter according to the
DVB-S standard. DVB-S stands for Digital Video Broadcasting Satellite. There are
several amateur websites at this moment which discuss the topic of digital
amateur television but on most of them there is less technical background
information available. Digital transmission techniques requires some severe
technical background knowledge because digital modulated signals behave
completely different in the transmission path with respect to the traditional
wideband frequency modulation techniques. Lack of knowledge might lead to misuse
of our scarce frequency space.<BR><BR>The introduction of digital modulation
techniques for amateur use, specifically as an alternative for analog amateur
television and the fact that just a few amateurs are able to develop a complete
digital system, inspired us (pe1jok and pe1obw) to discover this new dimension.
Our greed for knowledge leaded to the development of our own digital amateur
television transmission system according to the DVB-S standard. At this moment
we succeeded with our mission and we are proud to announce that we are the third
independent group in Europe who finished the development of a working D-ATV
system. Although our system is fully functional we are still working on extended
possibilities of our DVB-S modulator with the main aim to stay ahead with all
kind of technical issues. You can read these pages which might give you a bit
more insight and maybe you'll find here some answers which you won't be able to
find on other D-ATV websites.<BR><BR>Within these pages we want to give you more
insight in the world of digital transmission. This will be done with a more or
less theoretical description of the different modulation techniques and the
inherent problems. We believe that some severe knowledge must be present among
us when we all want to use digital video transmissions in the future.
Furthermore we will discuss some of the different professional standards that
currently exists for digital video broadcasting (DVB-S, DVB-C and DVB-T) and the
possibility for using these standards for amateur purposes.<BR><BR>More Info in:
</FONT></P>
<P><FONT face=Verdana>- </FONT><A href="http://www.d-atv.nl/sitemap.php"><FONT
face=Verdana>http://www.d-atv.nl/sitemap.php</FONT></A></P>
<P><FONT face=Verdana>- <A
href="http://www.von-info.ch/HB9AFO/datv_e.htm">http://www.von-info.ch/HB9AFO/datv_e.htm</A>~</FONT></P>
<P><FONT face=Verdana>- <A
href="http://www.baycom.org/~tom/ham/dcc2001/datv.pdf"><FONT
color=#000000>http://www.baycom.org/~tom/ham/dcc2001/datv.pdf</FONT></A></FONT><BR><BR><FONT
face=Verdana>Fonte: The Ultimate Resource for Digital Amateur
Television.</FONT></P></BODY></HTML>