Recent content by W1VLF

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    I Mie scattering in clouds at 940 nm

    Hello Hutch, As ham radio operators we are very used to using less than optimal signal strengths. Quite variable would be fine if I knew how to somewhat predict what was going to happen to the returned light . Is signal strength what you wish to maximize? Yes that would be a desired outcome...
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    I Mie scattering in clouds at 940 nm

    Hello Gleb.. Yes we have found that in terrestrial experiments. Lower dew point means better signal strength. Same with the light our eyes can see. We have a water tower 10 miles distant that we use as a visual aide Paul W1VLF
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    I Mie scattering in clouds at 940 nm

    Hello Hutch, Sorry for the delay I was away all weekend. First thank you so much for taking the time to answer. I agree I need to frame the question much better. Please bear with me as I am not a scientist and never went to college, just self learning . 2 attached screen shots. The first...
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    I Mie scattering in clouds at 940 nm

    Noise from DC illumination shows up as noise, white noise or a decrease in Signal to noise ratio. However back in the early days of these experiments when using baseband for instance listening to 0 to say 10 kilohertz there was lots of weird stuff reflected back from the clouds or even looking...
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    I Mie scattering in clouds at 940 nm

    Laser pose too many problems for taste. Safety first, but after that they are not likely to be a good way to go to illuminate a cloud. At cloud height of 2000' a 1 milliradian divergence laser would illuminate a roughly 2' diameter spot on the clouds If the clouds were a flat homogenous...
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    I Mie scattering in clouds at 940 nm

    I know I am new here, and folks don't know me but I never mentioned lasers high or low power at any wavelength
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    I Mie scattering in clouds at 940 nm

    Of course not !! All my experiments are done with LEDs having a typical beamwidth 6 to 15 degrees. Not .057 degrees in a typical handheld laser. I am curious why you would ask me that question? Paul W1VLF
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    I Mie scattering in clouds at 940 nm

    Hi Mike, I should have been a lot more specific about what's going on in the experiment. I'll try to answer those questions here. The LED emits 940 nanometer light, that light is switched on at a 50% duty cycle at a 14 kilohertz rate. 14 kilohertz is not critical it's just the frequency I had...
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    I Mie scattering in clouds at 940 nm

    Yes,,,, Code is no longer a requirement, Sorry i missed that in your post. I worked at the ARRL for 3 years as an RFI engineer in the Lab, Been a ham since 1979
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    I Mie scattering in clouds at 940 nm

    Hello Mike!! Thanks for replying. Nice to see fellow ham on here.. I am a little bit intimidated by the level of questions asked here and worried I posted to the wrong are a or inappropriate question. Thanks for saying hello it goes a long way to see another ham on here Paul W1VLF
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    I Mie scattering in clouds at 940 nm

    How did you find PF?: Google search [Mentor Note: Two threads merged] I am an amateur radio operator call sign W1 VLF. Currently I have been experimenting with optical communications using 940 NM light through free space. Having accomplished twenty-five mile communications links using...
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