Re: TI-H: hey (cont.)
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Re: TI-H: hey (cont.)
Jumping a little ot here, but would you happen to know why blue is so hard
to make? I kinda started wondering a few years ago when I often worked with
LEDs and noticed that I could get one type of red LEDs for $1 a piece and a
blue one of the same type would cost around $11. What's the story behind
this?
Markus Räty
(markus.raty@usa.net)
----- Original Message -----
From: Olle Hedman <oh@hem.passagen.se>
To: <ti-hardware@lists.ticalc.org>
Sent: Thursday, January 27, 2000 1:26 AM
Subject: Re: TI-H: hey (cont.)
>
> Sassamo16@aol.com wrote:
> > i also had a similar idea with different colors, although slightly
different
> > instead of red=1, blue=2, green=3, etc., it would be
> > red=0, blue=1, green=10, orange=11, etc.
> > the would only be helpful in data transfer though, not data storage
>
> different colors is behaveing differently in the same medium. The reson
they
> have choosen the color they have is that that color is tranfered with the
least
> loss at an affordable price of the light generator.
> To have differnt colors in the same fibre would raise a lot of problems.
one is
> the transmitting device. blue is very hard and expensive to make for
example.
> another one is the resciver. As for now, you only have to detect light or
no
> light. That is MUCH easier than detect different colors.
> something close to your idea is actually used in modern modems, that send
> several bits per baud, by modulateing both phase and amplitude.
> as for today, your technique would be far to expensive and bulky. apart
from the
> problem with different signal loss of the different colors.
> maybe in the future.
>
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