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<H1 class=title>DRM Consortium welcomes shortwave tests in Alaska</H1>
<P><FONT face=Verdana>The <STRONG>Digital Radio Mondiale Consortium</STRONG>
(DRM) says it’s pleased to learn that the Federal Communication Commission (FCC)
of the USA has granted a licence to Digital Aurora Radio Technologies (DART)
that will conduct a 2 year experiment for coverage of the state of Alaska with
DRM signals in three of the lower shortwave bands around 5, 7 & 9
MHz.</FONT></P>
<P><FONT face=Verdana>The Consortium says that if the tests show excellent
results for digital broadcasts to cover the entire state, the next step would be
to obtain approval to use the DRM system and the transmission station for a
regular broadcasting service.</FONT></P>
<P><FONT face=Verdana>Alaska has a surface area of approximately 1,300,000
square kilometres. With one DRM transmission, either 10 or 20 kHz in bandwidth,
the entire state would be covered with approximately “FM-like” quality for up to
4 simultaneous programmes, such as four different languages of
newscasts.</FONT></P>
<P><FONT face=Verdana>Because of the severe ionospheric propagation conditions
at the high latitudes for the state, these experiments will yield valuable
information on what is needed to get excellent audio coverage at realistic
powers for this concept – that is, for “regional coverage” on the order of
hundreds of thousands to perhaps 2 million square kilometres from one shortwave
transmitter located “in the middle” of the coverage area.</FONT></P>
<P><FONT face=Verdana>The full test plan will include several variations of DRM
system variables in order to determine which combination works best under the
different ionospheric propagation conditions to be encountered. For the latter,
this includes sunspot number, season and time of day.</FONT></P>
<P><FONT face=Verdana>For the former, it involves different levels of audio
quality for example with or without stereo and different levels of error
correction. Finally, there is the choice of the 3 shortwave broadcasting bands
at around 5, 7 & 9 MHz.</FONT></P>
<P><FONT face=Verdana>Fonte: Media Network, DRM
Consortium<BR></FONT></P></BODY></HTML>