[Laser] LED Transverter for commercial manufacture

[I]

HI Tim and Les, 
the LED modification is quite straightforward, anyone capable of making up the electronics should also be capable of simply pressing a sharp knife through some silicon gel to cut the wire to the protection diode.


I would not say that any other LED would not work, simply that I have not tried any other power LEDs out. The other LEDs I tried that worked were 5mm and 8mm conventional low power types. The 6.5km contact was using a 5mm LED with about 50mA through it.. There seem to be plenty of the type I use available from various suppliers. I would not tell the LED manufacturers, they would probably put the price up!


RS Components Ltd over here in Europe are now stocking a more powerful Platinum Dragon LED that I may get round to investigating.The technology is the same as the one I use so it  could well do the same trick. It will probably mean finding out the correct reverse bias voltage for it, but that is easy.



Stuart, G8CYW




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Subject: Laser Digest, Vol 73, Issue 18


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Today's Topics:

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Message: 1
Date: Tue, 23 Nov 2010 13:50:05 -0800 (PST)
From: Tim Toast <toasty256 at yahoo.com>
Subject: Re: [Laser] LED Transverter for commercial manufacture
To: laser at mailman.qth.net
Message-ID: <390220.63491.qm at web37904.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

hi Les
Makes sense to me. Maybe it wouldn't take too much persuasion since 
it is virtually a guaranteed money-maker for them. It might also help 
to have the LED maker(s) be aware that their LEDs have a special
property that lets them detect light as well as generate it. If they
knew there could be a special market for certain LEDs maybe they 
would also help persuade a manufacturer. 

-toast

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> Message: 1
> Date: Mon, 22 Nov 2010 11:05:35 -0600
> From: "Les Rayburn" <les at highnoonfilm.com>
> Subject: [Laser] LED Transverter for commercial
> manufacture
> To: <laser at mailman.qth.net>
> Message-ID:
> <F045103D045F46F3871277D808516484 at ownerVAIO>
> Content-Type: text/plain;???
> charset="utf-8"
> 
> It seems to me that one impediment to the popularity of
> optical as a VHF/UHF ?band? is that the efforts to date have
> been strictly ?home brew?. While that is an exciting and
> enjoyable pursuit for many, we?re not likely to see any real
> growth in this mode until there is some standardization of
> equipment, modes, and operating procedures. 
> 
> Most VHF/UHF weak signal operators are very accustomed to
> using transverters already, so I think the idea of an LED
> transverter could prove to be very popular. Married to a
> common IF rig such as the Yaesu FT-817ND, this would allow
> operators to simply add the ?optical? band to their
> capabilities by inserting the transverter into their chains.
> 
> 
> Many rovers already carry heavy duty tripods for use with
> 10GHz dishes, so swapping out for optical work would not be
> that difficult. 
> 
> If a commercial company, like Downeast Microwave could be
> enticed to add an optical transverter to do their product
> line, then I think we?d see some real growth in the
> popularity of this band. A transverter also opens the
> possibility of using more exotic modes such as WSJT to push
> the boundaries in terms of DX. 
> 
> I wonder if others on the list think this idea has merit? 
> 
> 73,
> 
> Les Rayburn, N1LF
> EM63nf
> 



      


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