On a sunny day (Sat, 21 Apr 2018 15:36:00 +1200) it happened
nospam.Henri.Derksen@f1208.n280.z2.binkp.net (Henri Derksen) wrote in
:

>Hello Jan,

>Have you ever seen this:
>RONJA (=Reasonable Optical Near Joint Access)
>http://ronja.twibright.com/about.php
>Free translation to Dutch:
>ZODAT (=Zinvolle Optische Dichtbij Aansluit Toegang)

No, I just checked that out.


>It gives you an IR wireless link to another friend nearby at 10 MBit FD
>EtherNet. I love this 100 % selfmade connections.
>There are full descriptions of how to build and test this.
>Especially the option to keep de glasses free of condensation for instance.
>For resistors in a rectangle setting for heating the glasses from inside.
>But this RONJA is not suitable on inland ships (my other hobby),
>because of all the movements ships always have ;-(.
>Think about up/down, turn left/right, rolling, stamping, gearing etc.

Yes, I remember a German university maybe 10 years or so ago modulating the
office lights
to make a LAN.

Much longer ago I started playing with IR diodes and lasers, at that time
helium neon lasers.
Here a warning is in place, apart from Schiphol airport alert that some alien
spacecraft was detected the same day I tried the HeNe thing,
I also got hit in the eye by a simple reflection from a thee spoon in the room,
no harm done, but it did hurt, so beware.
This because I see they want to go and use laser pointers.
Also the pointing with lasers is very critical.
This is one of my arguments against those scanning lasers for selfdriving cars,
with millions (several per car) scanning lasers around I do not want to be on -
or near the road.
For the rest the 'tronix hard-and software is indeed simple can can be build in
a day or 2 maybe.
There are also IR based simultaneous translations system in use all over the
world,
little radios that listen on IR for translation in conferences etc.
As soon as you have 2 way you can do Ethernet, that is obvious.

BTW did you receive my email about that large file and did you get it? because
I removed it again after a while.



>I also have seen discs in a dome that move in the oposit direction the ship
>moves, to get a constant good link to the satelite they follow.

Yes, you can buy that stuff, still expensive, around 1500 Euro last time I
looked.
Would be nice for 2 way if you used one of the satellite internet providers.
Coverage? I have considered that, probably much of the North Sea (for sure) and
Atlantic, much cheaper than satphones in use.
I have read Elon Musk is working on launching a new satellite service,
competition is good, prices may come down.


>That is possible both for tv wathing as an internet link via satelites.
>But they ask such high prices for such equipment and contributions ;-(.

>I think the new DigiTenne DVB-T2 is a more cheaper solution.
>In Germany there is already DVB-T2 for television,
>but in the Netherlands they still only use DVB-T1.
>And only NPO1, NPO2, NPO3 and one local tv-transmission are Free to Air.

Yes, well I do get lousy digitenne reception at home, but I have cable so who
cares.
I think, personally, digitenne is dead.



>I have two information packets avaialble for hobbyists in Dutch.
>One is a selfbuild AIS+ECDIS for inland ships with a Raspberry Pi 2B/3B+.

Yea, well I got my own AIS stuff working very well, great conditions too for
AIS today, screen full of ships this morning.
I have many projects going, need to update the website some day.....
Now I was playing with gammaspectromerty (is identifying radioactive isotopes,
may need that with strumpf).

--- SoupGate-Win32 v1.05