In theory it's a good Idea which I had some weeks before without working it out.
Years before I also have made tests with FTA (free to air) optical
transmissions with a DL2CH-Transceiver and a TRX-Kit by Aatis which is quite
much simpler.
Even with that it was no problem to link between two points about a few meters.
In this case you should think about an IR-LED. Unfortunately, the Aatis
receiver has a photo transistor instead of a diode. But it should be no great
deal to modify that.
The problems with FTA optic transmission for this application are imho:
- You have to be sure, that no one can be injured by the laser beam, especially
at unattended operation.
- Think about how many hours/the beam has it's full power before becoming much
weaker.
- The optics must be kept clean. This could be a problem if the units are out
of reach.
- The units have to be mounted absolutely stable. For Example, on a swinging
fibre rod you'll never bring a laser beam exactly to the rx area.
I bet, (FTA) optical transmission just changes one problem with a few others.
But the transmission with optical cable seems interesting.
What type of cable do you suggest? I do not think, my TOS-Link cable would
stand weather/UV and mechanical conditions outside for a long time.
Horst DO1KHS
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