I think this is one of those "theory vs. the real world" arguments. It reminds me of the time I got in an argument with an electrical engineer about single-sideband radio. He insisted that single sideband transmission couldn't be done, that you couldn't make filters that sharp. I pointed out that I'd talked on single-sideband radios on many occasions, and that they worked just fine. Of course, they weren't, strictly speaking, perfectly filtered -- but if the unwanted sideband is attenuated more than 40 dB from the desired signal, who cares? It's effectively gone, for all practical purposes.
David Brodbeck, N8SRE '82 Diesel Westfalia '94 Honda Civic Si -- For Sale '86 Volvo 240DL wagon |
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