[Tagging] Radio telescopes
61sundowner at gmail.com
Thu Oct 25 20:45:19 UTC 2018
On 25/10/18 23:56, Paul Allen wrote:
> On Thu, Oct 25, 2018 at 1:20 PM Andrew Harvey
> <andrew.harvey4 at gmail.com <mailto:andrew.harvey4 at gmail.com>> wrote:
> So the tower issue aside, if the dish is used for two way
> communication then:
> man_made=tower + tower:type=communication +telescope:type=radio +
> I would say that is the case even for one-way communication (either
> direction). The hint is
> in the word "communication" - if it's used for communication then it
> doesn't matter whether
> in one direction or two.
> If the dish is used for receiving only (whether looking at the
> stars or
> reviving signals from humans in space) then:
> man_made=telescope + telescope:type=radio + tower:construction=dish
> Again I have to disagree. One is used for observing the other is used
> for receiving
> communications (hint: "communication").
> Of course, the same dish might be used for both purposes, switching
> from one use to the
> other as required, so any tagging scheme ought to cope with that.
> And then there's SETI. I'd say that right now all SETI antennas are
> telescopes but there is a
> possibility at some future time that some of them may become
> communications antennae.
> BTW, these days few radio telescopes are dishes. Most of them are
> phased arrays and not on towers
> or masts.
That depends on the frequency of operation.
New dish reflecting ones are being build. They simply perform the best
for the intended frequencies.
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