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Message-ID: <264E8DA6D7864F87BDA5D339F0900968@lindavideo>
From: "Ken" <ken.h.wright@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <1542517694@web.de> <6F962616C1CC4C1B844AF099CB1BB55D@lindavideo> <000f01ca7fc2$c666f6a0$0301a8c0@your91hoehfy9g>
Date: Fri, 18 Dec 2009 09:48:50 -0000
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Subject: LF: Re: Re: Re: RE: Noise cancelling by using optic transmission of RX signals
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As an addition to my last posting on this subject be careful if you see 
optical cards for sale at rallies etc, they all should/must have the laser 
'starburst' symbol on them, and may be labelled as either, laser product, 
class 1 laser, or class 3 laser, what they will not tell you is the power 
output, you will need a calibrated optical power meter for this, or the 
wavelength, which could be 850nm multi

73.
Ken
M0KHW


mode, 1300nm single mode or 1550nm single mode. When I was working on 
optical systems the standard BT optical connector for main network single 
mode fibre was the FC  type, originally manufactured by Seiko..
----- Original Message ----- 
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Friday, December 18, 2009 9:16 AM
Subject: LF: Re: Re: RE: Noise cancelling by using optic transmission of RX 
signals


> Radio Amateurs BEWARE - Appliance Operators DO NOT TOUCH
>
> G3KEV
>
>
> ----- Original Message -----
> From: "Ken" <ken.h.wright@btinternet.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Thursday, December 17, 2009 10:43 AM
> Subject: LF: Re: RE: Noise cancelling by using optic transmission of RX
> signals
>
>
>> Optical fibres are fine for transmission and remove all the problems of
>> interference and cross talk at a stroke, but please be careful and 
>> observe
>> optical safety precautions when using lasers and other light sources. I
>> worked on optical systems for many years during my time with BT, and
> optical
>> safety took priority over every thing else. All optical fibres need to
> have
>> a perfect cleave on the ends, and the connectors  be absolutely clean, if
>> you are not launching into an optical connector then alignment will be a
>> problem, similarly at the receive end.
>>
>>
>> 73.
>> Ken
>>
>> M0KHW
>>
>>
>> ----- Original Message -----
>> From: "Horst Stöcker" <horst.stoecker@web.de>
>> To: <rsgb_lf_group@blacksheep.org>
>> Sent: Thursday, December 17, 2009 9:01 AM
>> Subject: LF: RE: Noise cancelling by using optic transmission of RX
> signals
>>
>>
>> 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
>> ___________________________________________________________
>> Preisknaller: WEB.DE DSL Flatrate für nur 16,99 Euro/mtl.!
>> http://produkte.web.de/go/02/
>>
>>
>>
>>
>
>