[Tagging] Radio telescopes

[Warin]

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 +
>     tower:construction=dish
>
>
> 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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