Re: Infrared reciver


<grapev@xxxxxxxxx> wrote in message
news:nnpt81922876v10dmoimlvk2bp2ahe8pbb@xxxxxxxxxx
> On Fri, 20 May 2005 19:36:50 -0700, "Watson A.Name - \"Watt Sun, the
> Dark Remover\"" <NOSPAM@xxxxxxxxxxxxxx> wrote:
>
> >
> ><grapev@xxxxxxxxx> wrote in message
> >news:cf7s8158g8hq5fi6g52i3kr8fk2smc0mjn@xxxxxxxxxx
> >> On Fri, 20 May 2005 04:57:07 -0700, "Watson A.Name - \"Watt Sun,
the
> >> Dark Remover\"" <NOSPAM@xxxxxxxxxxxxxx> wrote:
> >>
> >> >
> >> ><grapev@xxxxxxxxx> wrote in message
> >> >news:p46r81hm5u9a930pkg82ptn9cbcsj72c05@xxxxxxxxxx
> >> >> I am looking for a IR reciver module with bandwidth greater the
> >common
> >> >> 40khz (namely 10 to 100mhz or more) and a recemendation for a
> >suplier
> >> >>
> >> >> Thanks
> >> >> Jeromie
> >> >
> >> >
> >> >I would suggest looking at the receiver modules for fiber optic
> >cables,
> >> >probably for single mode FO cables. But then you didn't say what
> >> >wavelength IR you were using. You may have to build your own
using
> >> >photodiodes.
> >> >
> >>
> >> I thought about using fiber modules. I was/am worried that they
would
> >> not work well due to packaging (and im not to hot on cutting one up
> >> just yet). Having never used one in this way, Does the packaging
need
> >> to be modifide or is there one that is already in shape for this
type
> >> of project? Using a photo diode would be fine if I could find one
that
> >
> >What project? Oh, now I see, below.
> >
> >> I knew of one that would work well. Yes ive hit google but find
little
> >> in the way of user experiance for the units I found. Ive not yet
> >> settled on a exact wavelength. If using fiber modules it will have
to
> >> be around 850nm, 1300nm and 1550nm as that is what all the units
ive
> >> seen operate in. If using a photodiode then likely around 750 to
900nm
> >> as most of the IR leds ive seen are in this range. I should check
the
> >> fiber modules and see if the respond to this range also. I wonder
if
> >> it possible to couple FSO into a fiber? This project is for `just`
1/4
> >> mile links. A few friends and I want to build a 10 or 100mbit
ethernet
> >> ring between our homes.
> >
> >Build the Ronja Metropolis. http://ronja.twibright.com/
> >
> >> Jeromie
> >
>
> Ive a much simpler design and I have been told that the Ronja has
> issues with part stability. I do use that site for some info, along
> with a number of others (they all do voice/serial over a pen laser and
> one does 144khz fm (I think that was it, ill need to find it agian)).
> I could always find a ethernet to fiber driver and repalce the laser
> section.
>
> Jeromie

I hadn't heard of that deficiency. But the Ronja and all light beam
systems have the same vulnerability to fog and precipitation. If I were
going to set up a link, I would use a pair of WAPs and a pair of decent
antennas.

A friend of mine has a 600 foot link that he put together with a pair of
WAPs and the tin can antennas that can be found on the 'net. It's not
very reliable, partly because of electrical reasons but also because the
wind causes the antennas to not point at each other. I pointed him to
the www.hyperlinktech.com website and told him to get rid of the
troublesome can antennas (he doesn't know anything about RF) and buy a
pair of decent antennas from them. But he hasn't done so yet. :-/

At lease he did buy some decent LMR400 coax cable.


.

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