Re: Questions (Space)

On Sep 7, 2:10 am, "Logan Kearsley" <chrono.sur...@xxxxxxxxxxx> wrote:
<aoa...@xxxxxxxxx> wrote in message

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On Sep 6, 5:17 pm, FennelGiraffe <sraarytven...@xxxxxxxxxxxxxxxxx>
wrote:
Tina_H...@xxxxxxxxxxx (Tina Hall) wrote in news:MSGID_2=3A240=2F2199.13=
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FennelGiraffe <sraarytven...@xxxxxxxxxxxxxxxxx> wrote:
Tina_H...@xxxxxxxxxxx (Tina Hall) wrote
[...]
Does the beam itself carry the information (how?) or is it more like a
morse signal? (Or just different strengths of the beam, rather than a
simple on/off?)

The beam is "modulated", but I can't find an explanation for what that
means. I'm fairly certain it isn't a simple on/off, though. It's most
likely a variation in strength or some other attribute.

There are three kinds of modulation you can apply to a wave to encode
information - amplitude, frequency and phase.

Four. Amplitude, frequency, phase, and polarization. Phase is how far the
waves are shifted from some reference wave. Polarization is what direction
the waves are oscillating in.

Indeed so, and I really should have remembered polarization
modulation, given the importance to quantum cryptography...

Sam

.

Relevant Pages

  • Re: Questions (Space)
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  • Re: Circular polarization... does it have to be synchronous??
    ... It is commonly understood that polarization of electromagnetic waves may be either linear or circular. ... The two extreme special cases of this are linear and circular. ... For example most common linear amateur antennas produce and/or respond to waves of linear polarization, and these antennas produce either either horizonally or vertically polarized waves depending upon the orientation of the antenna with respect to the earth's surface. ...
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  • Re: Through a glass darkly
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