Date: Thu, 17 Dec 2009 10:01:34 +0100
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From: =?iso-8859-15?Q?Horst_St=F6cker?= <horst.stoecker@web.de>
To: rsgb_lf_group@blacksheep.org
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Subject: LF: RE: Noise cancelling by using optic transmission of RX signals
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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 transmi=
ssions 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 me=
ters.

In this case you should think about an IR-LED. Unfortunately, the Aatis re=
ceiver has a photo transistor instead of a diode. But it should be no grea=
t 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, espec=
ially 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 swingi=
ng 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 othe=
rs.

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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