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4 February 2021.
Light wavelengths.
Light communications.
Visible light radiation.
Optical astronomy.
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25. Visible light and Somalia photos 44.
25.
Visible light.
Light.
Light communication.
Light communication systems.
Light communications.
Light communications systems.
Light research.
Light experimentation.
Light astronomy.
Astronomy on Light frequencies.
Astronomy on Light wavelengths.
Optical astronomy.
Astronomy on optical frequencies.
Astronomy on optical wavelengths.
420,000 – 750,000 GHz.
Light electromagnetic radiation.
Electromagnetic light radiation.
Frequency 420,000 – 750,000 GHz.
Wavelength 400 – 700 nm.
The frequency of light is 420,000 GHz – 750,000 GHz.
The frequency of visible light is 420,000 GHz – 750,000 GHz.
The frequency of light is 420 – 750 THz.
The frequency of visible light is 420 THz – 750 THz.
The wavelength of light is 400 – 700 nm.
The wavelength of visible light is 400 nm – 700 nm.
Visible light 400 – 700 nm (420 – 750 THz).
400 nm – 700 nm (420 THz – 750 THz).
Visible light 700 – 400 nm (420 – 750 THz).
Visible light 700 nm – 400 nm (420 THz – 750 THz).
Visible light 0.7 – 0.4 µm (420 – 750 THz).
Visible light 0.7 µm – 0.4 µm (420 THz – 750 THz).
Visible light 0.7 – 0.4 µm (420000 – 750000 GHz).
Visible light 0.7 µm – 0.4 µm (420,000 GHz – 750,000 GHz).
Introduction to light.
https://courses.lumenlearning.com/boundless-physics/chapter/the-electromagnetic-spectrum/
http://science.hq.nasa.gov/kids/imagers/ems/visible.html
http://en.wikipedia.org/wiki/Light
http://en.wikipedia.org/wiki/Speed_of_light
Hubble Space Telescope, the optical (visible light) telescope in Space.
http://en.wikipedia.org/wiki/Hubble_Space_Telescope
https://www.nasa.gov/mission_pages/hubble/main/index.html
OPTICAL COMMMUNICATIONS.
https://en.wikipedia.org/wiki/Optical_communication
CLOUD BOUNCE.
Communications using light reflected by clouds.
Morse code and voice communications using light.
Communications by using clouds to reflect light.
Amateur Radio Microwave to light waves distance records.
https://www.microwavers.org/index.htm?records.htm
Australia.
Space communications station using light in Western Australia.
https://www.itnews.com.au/news/new-space-communications-station-to-be-built-in-wa-554620_
Amateur radio operators transmitting Morse code and voice on light in Australia.
Transmission of light using Cloudbounce (light reflection off clouds) from Tasmania to Victoria in Australia on the 27 October 2009 covered 288 km (179 miles).
Light communications across 209 km (130 miles) using light in Tasmania, Australia.
https://www.amateurradio.com/tag/cloudbounce/
https://www.reast.asn.au/information/optical-transmissions/
https://www.modulatedlight.org/Modulated_Light_DX/OpticalComms4Amateur79.html
https://worldradiohistory.com/hd2/IDX-AUSTRALIA/IDX/Amateur-Radio/00s/Amateur-Radio-AU-2009152.pdf
Communications using light.
http://www.bluehaze.com.au/modlight/
http://www.bluehaze.com.au/modlight/GrothArticle1.htm
http://www.bluehaze.com.au/modlight/Luxeon.htm
http://www.bluehaze.com.au/modlight/UltrasoundMod.htm
http://www.bluehaze.com.au/modlight/modlightrx.htm
Light communications from 1968 to 1980.
http://www.bluehaze.com.au/modlight/LongArticle1Jan79.htm
Light communications from 1879 to 1940
http://www.bluehaze.com.au/modlight/ModLightBiblio.htm
Light communications in 1899
http://www.bluehaze.com.au/modlight/Heliograph.htm
Australian license, dated 1978 to modulate light at a frequency of 30 kHz. Today no license is needed in Australia to experiment and communicate using light waves.
http://www.bluehaze.com.au/modlight/LongArticle1Jan79.htm
Germany.
Amateur Radio above 275 GHz in Germany..
Japan.
Visible Light Communications VLC between Earth and satellite.
https://directory.eoportal.org/web/eoportal/satellite-missions/s/shindaisat
United Kingdom.
Amateur Radio from 275 GHz to 3000 GHz in the United Kingdom.
In the UK there are no regulations for frequencies above 3000 GHz 3 THz.
https://rsgb.org/main/operating/band-plans/microwaves/terahertz/
Amateur Radio light communications.
https://sites.google.com/site/g3xbmqrp3/optical
https://sites.google.com/site/g3xbmqrp3/optical/481thz-nlos
Optical communications using laser.
https://crdars.org.uk/club-meetings/optical-communications-using-lasers/
USA.
Amateur Radio above 275 GHz in the United States.
http://www.arrl.org/frequency-allocations
Amateur radio operators transmitting Morse code and voice on light in the USA.
Cloud bouncing light carrying 488 Hz and 976 Hz Morse code signals.
BUILD A LIGHT TRANSMITTER and a light receiver to bounce Morse code signals off overhead clouds.
You can hear your light signals reflected from clouds. The transmitter will carry a 488 Hz and 976 Hz signal up to the clouds and some of that light with the 488 Hz and 976 Hz signal will be reflected by the clouds back to Earth and picked up by your light wave receiver.
Free computer software can be downloaded to make signals in the noise sound very nice.
Listen here to light waves being reflected off the clouds with and without computer processing.
http://www.qsl.net/w1vlf/techinfo/techinfo.html
BUILD AN OPTICAL LIGHT TRANSMITTER, ANTENNA AND DETECTOR (LIGHT RECEIVER) FOR CLOUD BOUNCE. This is a 15 Watt transmitter using Light Emitting Diodes (LEDs) with the antenna (Lens) and the receiver (solar panel).
http://www.qsl.net/w1vlf/techinfo/optical_transmitters.html
http://www.qsl.net/w1vlf/index.html
Amateur Radio optical communications using light waves.
https://www.ad7oi.com/FILES/n6izw_AD7OI_opticalshow2011a.pdf
https://www.modulatedlight.org/optical_comms/optical_index.html
https://hackaday.com/2012/09/22/communicating-with-a-beam-of-light/
Optical astronomy looks at visible light wavelengths.
Mogadishu airport in Somalia seen from space.
Using light wavelengths this photo was taken from 190 nautical miles (352 km) above Somalia from the International Space Station (ISS) showing Mogadishu city, Mogadishu airport (top centre) and the Mogadishu new sea Port (left) on the 28 October 2008. The white circles are clouds. (Photo thanks to NASA).
Mogadish harbour (Mogadishu harbor) in Somalia seen from space.
Using light wavelengths this photo was taken from 190 nautical miles (352 km) above Somalia from the International Space Station (ISS) showing Mogadishu city and Mogadishu old sea port (top centre) on the 28 October 2008. The white circles are clouds. (Photo thanks to NASA).
Mogadishu roads and the coast in Somalia seen from space.
Using light wavelengths this photo was taken from 190 nautical miles (352 km) above Somalia from the International Space Station (ISS) showing Mogadishu roads, Mogadishu city and the Mogadishu coast on the 28 October 2008. The white circles are clouds. (Photo thanks to NASA).
This is how the human eye sees the Earth from space.
The human eye sees visible light wavelengths.
This is the Earth, Africa, Somalia and Saudi Arabia seen when travelling to the Moon.
This is the Earth as seen by the Apollo 17 astronauts as they traveled to the Moon on the 7 December 1972. Four days later on 11 December 1972 Harrison Schmitt and Gene Cernan walked on the Moon. They are the last of the 12 humans that have so far walked on the Moon.
(Photo thanks to NASA).
How to build a radio station in Somalia.
How to build a radio station antenna in Somalia.
The hard working Somalia team with the rotatable horizontal antenna in Galkayo, North East Somalia.
In August 1994 the Somalia ground team and the Somalia tower team with the new helmets and new safety belts (donated by a Western Australia mining company), new walkie talkies, new antenna and new radio equipment (donated by Rotary Australia and the Australian Government) and two Australian volunteers (Abdikarim Nur Mohamud 6O0W and Sam Voron VK2BVS, 6O0A) all came together to upgrade Radio Free Somalia (“Free for all to use” known later as Radio Galkayo).
Radio Free Somalia (“Free for all to use” known later as Radio Galkayo) had been established in August 1993 by the Melbourne Somali community and the same two volunteers at the Galkayo Police station, Galkayo, North East Somalia.
North East Somalia became the Puntland State of Somalia on the 1st August 1998.
(Photo Sam Voron 6O0A, VK2BVS).
Index https://sites.google.com/site/somaliaamateurradio/index1
Contact: Sam Voron VK2BVS, 6O0A.
Email somaliahamradio@yahoo.com
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