Martin Koppenhoefer <dieterdre...@gmail.com> writes:
> sent from a phone
>
>> On 26. Oct 2018, at 01:57, Greg Troxel <g...@lexort.com> wrote:
>>
>> for all things which are not buildings and basically exist to support
>> antennas, and avoid the tower/mast word choice, which is pretty clearly
>> contentious and/or confusing.
>
> what about this:
> https://upload.wikimedia.org/wikipedia/commons/1/11/Killesberg_Tower.jpg
That does not have as the almost entire purpose to support antennas.
There is substantial effort/expense to make it suitable for people in a
touristy way. So I would definitely not call that
"antenna_support_structure". And it's tall (that's the point) and not a
building, so calling in man_made=tower seems right.
> this is not a building, neither by the German nor by the English
> definition, but at least for Germans it is a tower. I would not
> require for towers to be a building (which at a minimum should provide
> some enclosed space).
fair enough. And I'm fine with this being tower in a world where
antenna supports are something else.
So where I think we are is:
there is almost zero support for the notion that guy wires or not is
critical and therefore these must not be part of definitions. (Maybe
just Graeme.)
There are really multiple sorts of things we are talking about:
A) towers that are more than for antennas, like Tokyo, Killesberg,
Eiffel, and other similar things that aren't really buildings but
which have a significant purpose beyond holding an antenna up high
B) things that support antennas that are big enough that a person --
almost certainly a professional antenna repairer/installer or tower
maintainer -- can climb up inside of, or stand on some top platform.
Usually lattice or some sort of >1.5m diameter tube.
C) things that support antennas that have lattice or foot platforms
and can be climbed by people externally, sort of like a ladder, with
a climbing harness, again only by trained people for repair/install.
Like Rohn 65. Probably includes 30cm tubes that have climbing
protrusions.
D) things that support antennas that are small enough that no person
can climb the outside. Ranging from 2cm diamater to maybe 20cm.
In my usage
A is a kind of tower
B and C are "antenna tower" (separate from the A type tower) in the
US. I gather in the UK B is tower and C is mast.
D is a mast in the US
I realize many here call A and B tower, and C and D mast.
B and C are often different only in scale. For example, B coudl be
triangular lattic that's 1.2m on a side, and C could be 0.5m on a side.
Once you can climb inside, one you can't. But they are almost the same
thing.
Perhaps the C tubes/steps belong in D. It is arbitrary.
With respect to guys, I would expect A and B to be almost never guyed,
and C sometimes guyed (especially as it gets tall), sometimes not. D I
would expect to be often short and not guyed, or taller and guyed.
So how we want to group and label these is really arbitrary. But it
would be good if we agree on the 4 groups of reality and then group
them, and stop saying that guyed/not is critically important.
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