Ham radio DIY portable VHF/UHF repeater
/This video shows how a portable amateur radio VHF/UHF crossband repeater can be easily put together.
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This video shows how a portable amateur radio VHF/UHF crossband repeater can be easily put together.
Mario Roessler DH5YM has made available a video showing amateur radio laser communications over a distance of 48 km
You can see the green Laser of DK5WMA Marcel and hear the demodulated telegraphy signal. The fading by humid air is clearly visible and audible. Unfortunately the autofocus of the camera does not like the dark environment.
The distance was about 48km between JO60LK and JO60MT.
On 11 July 2012, Surrey Satellite Technology US LLC (SST-US) signed a memorandum of understanding (MOU) with Virgin Galactic optimizing Surrey’s innovative satellites for Virgin’s new launch vehicle, radically lowering the cost of building and launching small satellites
This MOU comes on the heels of Virgin Galactic’s announcement of its new ”LauncherOne” program, an unmanned rocket that will be air-launched by SpaceShipTwo’s carrier aircraft, WhiteKnightTwo, and that will be capable of delivering as much as 225 kg to low Earth Orbit. SST-US and Virgin Galactic have agreed to work together to provide SST-US, the world leader in small satellite manufacturing, the information needed to build the most powerful spacecraft that LauncherOne can support, giving satellite customers a powerful and affordable option to put their payloads into space.
SST-US is the US operation of Surrey Satellite Technology Ltd (SSTL), the pioneer in small and cost effective space missions. The collaboration with Virgin Galactic is expected to involve the development by SST-US of new launcher-optimised satellite platforms, the supply of subsystems to the launch vehicle, and advising on market requirements for launch services.
Dr. John Paffet, CEO of SST-US, commented: “Since we launched our first small satellite in the Eighties, we have been changing the economics of space by leveraging innovation. As our platforms have become an integral part of many space programmes, launching satellites at a cost that is synergistic with the mission programme remains a challenge. We look forward to collaborating with Virgin Galactic on this exciting new venture to develop a solution to this need.”
LauncherOne will be a two stage vehicle capable of carrying up to 500 pounds (225 kilograms) to orbit for prices below $10 million. The rocket will be launched from Virgin Galactic’s WhiteKnightTwo, the uniquely capable aircraft also designed to carry SpaceShipTwo aloft to begin her suborbital missions. With more than 85 flights completed to date, WhiteKnightTwo has substantially completed her test flight program.
“Virgin Galactic’s goal is to revolutionize the way we get to space,” Virgin Galactic’s Founder Sir Richard Branson said. “I’m immensely proud of what we have already achieved as we draw near to regular suborbital flights on SpaceShipTwo. Now, LauncherOne is bringing the price of satellite launch into the realm of affordability for schools, non-profits, and start-ups, in addition to companies and space agencies.
This provides a completely new resource to the global research community, letting us learn about our home planet more quickly and more affordably.”
Virgin Galactic LauncherOne - http://www.virgingalactic.com/launcherone
SST-US - http://www.sst-us.com/
SSTL Press Release - http://www.sstl.co.uk/news-and-events?story=2044
BBC News Report - http://www.bbc.co.uk/news/science-environment-18801180
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