a few technical wireless questions

Unanswered Question
Jun 1st, 2009
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Hi all

can anyone tell me what the following means, what is preamble, short/long?

what is a good signal in -db ? and why is it a minus number?

what about noise? should we be looking for a minus number? is anything above 0 bad?

also what about gains, what effect does this have ?



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