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> This is very poor choice. Faraday depolarization will de-polarize all but
the
>closest possible LP microwave interstellar signals.
Here I respectfully disagree, Chip. My experience with 23 cm EME indicates
that Faraday rotation de-polarizes linear, but not circularly polarized,
signals. Binary circular polarization, as envisioned by Sagan, involved
transmitting the "ones" RHCP, and the "zeroes" LHCP. To a linear feed (as
used in the book) it looked like a steady carrier. To RHCP *or* LHCP it
looked like ICW, and to dual CP, it looked like binary with built-in
redundancy. I don't see how Faraday rotation could affect that.
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Uhhh.Paul...that's what I said. Read it again. LP depolarizes; CP doesn't.
OK:-)
Chip