Old 12-07-2009, 08:00 PM #17
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Default Re: Wavelength Options for my Thesis

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Originally Posted by steve001 View Post
Red I think would be your best option for long distances. See what these guys have done.
laser contact to france
these guys used 10mW lasers.. I imagine it would be much easier with a 500mW red or so. Even a 250mW would be a significant improvement, and Mohrenberg sells complete 250mW modules for $30.


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Old 12-10-2009, 03:23 AM #18
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Default Re: Wavelength Options for my Thesis

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Originally Posted by ossumguywill View Post
these guys used 10mW lasers.. I imagine it would be much easier with a 500mW red or so. Even a 250mW would be a significant improvement, and Mohrenberg sells complete 250mW modules for $30.
What they used

F/G0MRF/P. TX - 10mW focusable 670nm laser with a darlington transistor as a shunt modulator. Modulation: Crystal derived 488Hz. RX. 4 inch lens with OPT210 with TL071 buffer and LM386 audio amp.
G3GRO/P TX - 5mW laser pointer 488Hz modulation. Pointing aided by micrometer adjusters. RX OPT310 front end with 4 inch lens + external 5W audio amp I.C.
G8LSD/P TX 3mW 670nm laser with beam expander giving about 320 micro radians or 0.02 degrees divergence. Beam approx 2 inches by 1 inch. RX 110mm reflecting telescope. Detector OPT211 with low noise audio amp and external DSP audio filter.
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Old 12-10-2009, 03:45 AM #19
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Default Re: Wavelength Options for my Thesis

Quote:
Originally Posted by steve001 View Post
What they used

F/G0MRF/P. TX - 10mW focusable 670nm laser with a darlington transistor as a shunt modulator. Modulation: Crystal derived 488Hz. RX. 4 inch lens with OPT210 with TL071 buffer and LM386 audio amp.
G3GRO/P TX - 5mW laser pointer 488Hz modulation. Pointing aided by micrometer adjusters. RX OPT310 front end with 4 inch lens + external 5W audio amp I.C.
G8LSD/P TX 3mW 670nm laser with beam expander giving about 320 micro radians or 0.02 degrees divergence. Beam approx 2 inches by 1 inch. RX 110mm reflecting telescope. Detector OPT211 with low noise audio amp and external DSP audio filter.
yep. A 10mW laser. Go for 250+mW.
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