Infrared reciver

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 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.

Jeromie

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What project? Oh, now I see, below.

Build the Ronja Metropolis.

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

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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

At lease he did buy some decent LMR400 coax cable.

I know fog/rain cause attenuation. That should not be much of a problem for me as we only have 2 or 3 days of fog a year here. Rain tho we get alot of (this is Oregon after all). II am in eastern so we get 1/4 or so of the coast. Ive already got a wi-fi network inplace. the 11mbit rf (4.5~5mb data) isnt enough (nor is the 10 or 100 we hope to get, I will be runnign gigE in the house shortly). Ronja did give me hope as it looks like someone in the Czech Republic has at least 30 installed links. I will be making modifacations to Ronja so that it is simpler to build and hopefully more bandwidth. Time to read up on the license some more.

Jeromie