On a sunny day (Sun, 22 Apr 2018 19:43:00 +1200) it happened
nospam.Henri.Derksen@f1208.n280.z2.binkp.net (Henri Derksen) wrote in
:

>Hello Jan,
>
>JP> Yes, I remember a German university maybe 10 years or so ago modulating
>JP> the office lights to make a LAN.
>
>JP> Much longer ago I started playing with IR diodes and lasers, at that
>JP> time helium neon lasers.
>
>I have a hearing aid for tv listening that also works with IR.
>The first version was in mono and is much affected negative by the new low
>energy saving lightbulbs ;-(
>I had to place an emty toilet rol at the receiving ir led to catch the
>transmitted signal from the unit near by the tv set.
>You know this Sennheiser HD407S ?

No, but I have a Sennheiser HD201 headphones, good sound, and some earplugs of
the same manufacturer.
My hearing is almost supernatural so good.
I worked in audio in the studios of you know where.
But with age the very high frequency range is getting less and less.
Above 10 kHz it goes down these days.


>The later Ri810S sereo IR set did not have that problem.
>I also have FM version RR820S for the hard of hearing.

I have some bluetooth headphones, made in China too.


>JP> Here a warning is in place, apart from Schiphol airport alert that some
>JP> alien spacecraft was detected the same day I tried the HeNe thing,
>JP> I also got hit in the eye by a simple reflection from a thee spoon in
>JP> the room, no harm done, but it did hurt, so beware.
>
>I know, so never look into IR ligths. I now have a Bosch distance meter wit
IR,
>and since last year a Fluke 62 Max IR thermometer also with Led,
>but you can switch that red signal light off, if you want to.
>It works great up to 500 oC. I use it to signal the temp of very many things,
>but especially the diesel engines of my brothers inland ship, i.e cooling
>water, and exhaust temps.

Aha, I have one of these:

https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=+Temperature+
Gun+Non-contact+Digital+Laser+Infrared+IR+Thermometer&_sacat=0
amazing for that price, use it everyday, even for cooking.
I did put a piece of tape over the laser output hole.

Actually I get most stuff from ebay these days, I have some more fascinating
meters....
What you would like on board is something like this to measure DC:
 http://www.ebay.com/itm/372019406898



>JP> This because I see they want to go and use laser pointers.
>JP> Also the pointing with lasers is very critical.
>
>Yes.
>May be later on we get IR protected glasses to wear?

Yea, lasers, I have a lot of that stuff, and special glasses for red and blue
lasers,
this one is a bit more powerful:
 https://www.youtube.com/watch?v=qxx6hWDFxGs
  wearing special glasses there too.
I think I also uploaded one burning right through dyneema :-)
You can remotely cut dyneema rigging that way...
Maybe it was removed ?



>JP> This is one of my arguments against those scanning lasers for
>JP> selfdriving cars, with millions (several per car) scanning lasers
>JP> around I do not want to be on - or near the road.
>
>Yes, and for childern it is even more dangerous.
>But I think it is the same laser as used in supermarkets for scanning
>the goods you want to buy?

There is a physics thing, first of course 'nothing ever fails' (the scanning)
is not true,
since Murphy says "'it is not 'if' it fails, but 'when' ", many of those
scanning laser failures will
result in a direct beam.
The second thing is, if the beam scans left to right, and you turn right to
left at the same rotational speed,
then you protect a not scanning beam.
Traffic is all about turning all the time, so..


>JP> BTW did you receive my email about that large file
>
>Yes I did, but I was so busy after two weeks sailing in the second half of
>March, that I still did not have the time to answer your mail, sorry.
>
>JP> and did you get it?
>
>No, but I still would like to get it.

OK, link is back up, will leave it there till next Monday.


>JP> because I removed it again after a while.
>
>That is a pity.
>Can we arrange another try?
>
>JP> I think, personally, digitenne is dead.
>
>For the type 1 system you are right,
>but the new Type 2 has much more quality like HD tv


They are planning what's it? fifth generation network '5G' for cellphones,
If that really has the throughput they claim, then you can use that network for
streaming of movies, even on request.
 https://5g.co.uk/guides/how-fast-is-5g/

Why use 2 networks? Infrastructure is expensive, 10 Gbps is more than enough
for movies.
I do not have an ?pad atm, but if any of that stuff has HDMI output, then you
could stick it in your TV.
The national network could go on that.

The commercial are leaving digitenne in Germany:
 https://forums.theregister.co.uk/forum/1/2013/01/21/rtl_dtt/#c_1699524

I have satellite, a movable dish, and get a lot of German channels, also a lot
of UK channels and very old Bonanza on CBS ..
All FTA.
Wrote some scripts, basically all I have to say is 'show BBC one' and it will
pop up on my PC.
Or 'show CNN', same for RT (Russia today), CCTV (China) and hundreds (really!)
of others.
I have the voice control off normally, just type it in a terminal, voice is not
perfect and may be triggered by noise, is very old code.
The Dutch satellite channels were encrypted last time I looked, no idea what
they want to hide ;-)
I by now have about 900 DVDs with recorded movies.


Have fun on that river!

--- SoupGate-Win32 v1.05