Olá a todos!<br><br><br>Num forúm de que sou "cliente" surgiu a pergunta acerca das vantagens<br>da utilização do sistema D-Star e da instalação de repetidores deste tipo, nomeadamente no Reino Unido.<span style="font-style: italic;">
<span style="font-style: italic;"><br></span></span>Uma das análises feitas pelo Rick KV9U reporta assim:<span style="font-style: italic;"><span style="font-style: italic;"><br><br>"</span>The negatives of D-Star seem to me:
</span><br style="font-style: italic;">
<br style="font-style: italic;"><span style="font-style: italic;">
1) It has lower audio quality than FM voice, especially for average to </span><br style="font-style: italic;"><span style="font-style: italic;">
strong signals. This is very disappointing to me.</span><br style="font-style: italic;">
<br style="font-style: italic;"><span style="font-style: italic;">
2) The design to cripple the text data portion on the 2 meter/440 bands </span><br style="font-style: italic;"><span style="font-style: italic;">
is most unfortunate. They would have been much better off to design a </span><br style="font-style: italic;"><span style="font-style: italic;">
system using the full bandwidth for voice and allow you to switch over </span><br style="font-style: italic;"><span style="font-style: italic;">
to data if you needed to do this. Or at least have the option of </span><br style="font-style: italic;"><span style="font-style: italic;">
shrinking the voice bandwidth only when you needed to send data and I </span><br style="font-style: italic;"><span style="font-style: italic;">
suspect that won't be very often with most users.</span><br style="font-style: italic;">
<br style="font-style: italic;"><span style="font-style: italic;">
3) It does not work much farther, if any further, than existing systems. </span><br style="font-style: italic;"><span style="font-style: italic;">
This is a huge concern where I live as we have some directions where </span><br style="font-style: italic;"><span style="font-style: italic;">
even a very high repeater, with excellent antenna and power, can work </span><br style="font-style: italic;"><span style="font-style: italic;">
out less than 15 miles due to shading problems.</span><br style="font-style: italic;">
<br style="font-style: italic;"><span style="font-style: italic;">
4) Cost is a factor, but not the over riding factor, if there were </span><br style="font-style: italic;"><span style="font-style: italic;">
compelling reasons to move toward new technology. I was an early adopter </span><br style="font-style: italic;"><span style="font-style: italic;">
of VHF text digital messaging (packet radio) but that eventually died </span><br style="font-style: italic;"><span style="font-style: italic;">
out in our area. But at the time I was willing to spend money to get </span><br style="font-style: italic;"><span style="font-style: italic;">
some compelling benefits over VHF digital RTTY using a Model 15 Teletype </span><br style="font-style: italic;"><span style="font-style: italic;">
machine.</span><br style="font-style: italic;">
<br style="font-style: italic;"><span style="font-style: italic;">
5) If we tried to use it during an emergency, few hams would be able to </span><br style="font-style: italic;"><span style="font-style: italic;">
participate, therefore you would have to switch back to analog or lose </span><br style="font-style: italic;"><span style="font-style: italic;">
many participants.</span><br style="font-style: italic;">
<br style="font-style: italic;"><span style="font-style: italic;">
6) Analog FM has been helpful in attracting some new hams who listen to </span><br style="font-style: italic;"><span style="font-style: italic;">
the repeater. (It is simply amazing how many people listen and figure </span><br style="font-style: italic;"><span style="font-style: italic;">
out who you are when you live in a rural area like I do).</span><br style="font-style: italic;">
<br style="font-style: italic;"><span style="font-style: italic;">
7) Adding a digital repeater to our relatively new analog system that is </span><br style="font-style: italic;"><span style="font-style: italic;">
located on one of the highest points in the county and has emergency </span><br style="font-style: italic;"><span style="font-style: italic;">
power is very unlikely to ever happen in my lifetime. It would have to </span><br style="font-style: italic;"><span style="font-style: italic;">
be a lesser system with much shorter range and would only attract a </span><br style="font-style: italic;"><span style="font-style: italic;">
niche interest. I don't do digital ham radio because it is digital, I do </span><br style="font-style: italic;"><span style="font-style: italic;">
it when it has compelling reasons, which it does for text digital on HF.</span><br style="font-style: italic;">
<br style="font-style: italic;"><span style="font-style: italic;">
73,</span><br style="font-style: italic;">
<br style="font-style: italic;"><span style="font-style: italic;">
Rick, KV9U</span>"<br><br><br>Deixo à vossa consideração, relembrando mais uma vez que existem outros assuntos<br>que deverão ser tratados com mais alta prioridade do que este,<br>pois se ainda não conseguimos "resolver" a matéria atrasada (há 12 anos) corremos o
<br>risco de fazer uma "revolução" à pressa e esticar o passo para acompanhar o resto do pelotão.<br><br><br><br>Cumprimentos<br><br>Salomão Fresco<br>CT2IRJ<br clear="all"><br>____________________________________________________________________________________
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