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| Map showing coverage of the 471 THz optical beacon GB3CAM |
17 Nov 2011
A local 478THz (red light) beacon !
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Tower Bridge - NOT amateur radio
As we were in London to see "Guys and Dolls" at the Tower Theatre with our village theatre group, I decided to take this photo of ...
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6 comments:
Hello Roger
Some of the Tower blocks in the centre of Town
are changing over to energy efficient blue LEDs.
I can see these lights at a greater distance than
the red lights used on top of buildings.
Would you get a greater range with Blue LEDs or are RED
LED's better. What is the typical wavelength response
for a Photo Transistor.Can you see the red light beacon from your house. If someone was to fit an optical repeater on top of a tower with beams covering a larger footprint
that would open up a communication link to a greater number of Nanowavers.
Tony
Will you be able to do the test from the comfort
of your car or will have to do a bit of walking up to the
Local high spot to be In the beam footprint.
Tony
To see the Wyton beacon I will have to go out /P.
Roger
Have you designed any circuitry for this project yet?
Tony
So far I have used the circuit ideas from the RadCom articles back in March-May 2011. The optical head of the RX is working as expected using a reversed bias red LED as the detector.
@Anonymouns - blue light is more subjct to atmospheric scattering than red light, so you'll get better range (for a given power) at red than blue. Incidentally, that's one reason why brake lights and traffic light stop lights are red - you can see them from further away in adverse conditions.
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