Small Radio Telescopes for Amateur Astronomy
Вставка
- Опубліковано 22 лип 2024
- An online presentation hosted by Skyscrapers, Inc. on Zoom
Saturday, April 3, 2021
About the talk “Small Radio Telescopes for Amateur Astronomy”
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Describe the three frequencies used for small radio telescopes.
* Explain how to construct a small radio telescope to detect the 21 cm line of neutral hydrogen based on his personal experience.
* Give examples of three radio telescopes he built and used to collect data
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* Explain the three types of small radio telescopes that are available for the amateur community and the organizations supporting the small radio telescopes.
Prof. David Iadevaia graduated from each of the three public higher education instituted in RI...AS degree in electronics from RIJC, BA in Philosophy of Science from URI and MAT with astronomy specialization from RIC. While in Tucson his PhD from Pacific Western University was in online science education before it was popular but at the time is was not looked upon favorably.
Professor Iadevaia was hired in 1983 by the Smithsonian Astrophysical Observatory (SAO) and the University of Arizona as an instrument specialist for the Eschell Spectrograph at the Multiple Mirror Telescope...and moved to Tucson. When grant money ran out he was hired by Pima College to teach Astronomy and Physics retiring in 2013.
Known as Dr. I by his students, he developed various astronomy outreach programs while at the college. Most notable was the Professor Pima Portable Planetarium Program...an outreach to elementary schools with an inflatable planetarium...designed the teaching observatory and the Planet Walk at the East Campus. Initiated the “Lectures Under the Stars”...a series of informal lectures featuring famous local astronomers talking about their research to the public under the observatory ramada. Developed various online courses in astronomy most notable was the first astronomy online course with online observing from his private observatory 60 miles south of the college in Patagonia, Arizona...presented the results at a American Astronomical Society (AAS).
He was a member of the AAS and head of its archaeoastronomy working group for a brief time. He developed 3D visualization techniques to determine possible stellar alignments at archaeological sites.
He conducted several Total Solar Eclipse and archaeoastronomy expeditions for a science tour company to Peru and India.
He also wrote a science fiction book “Of Stranger Things” available on Amazon.
One cannot retire from science so he is still doing what he likes...having fun with astronomy, currently spectroscopy from his private observatory and his mobile observatory for public outreach. - Наука та технологія
Here is an excellent resource of beginner level radio astronomy videos
The videos are from members of SARA : Society of Amateur Radio Astronomy
www.youtube.com/@radio-astronomy/playlists
Hydrogen Line Radio Telescopes
ua-cam.com/play/PLCEbOD5_znsmOAz8fcIIF9JC-qogFntQN.html
Regards,
Alex KK4VB
15:08 - It may be for nostalgic reasons to build a large horn antenna. However, they are not used anymore today because yagis or dish antennas are much more effective for the material required and they are readily available. A WIFI-yagi comes at about 20 US$ and will beat the horn hands down.
A wifi yagi has nowhere near the gain of a large horn like what was pictured, and only works properly at wifi frequencies. A horn is broadband and works on a large range of frequencies. A 2.4GHz yagi isn't going to have a good pattern at 1.42 GHz because yagis are not wide bandwidth antennas. A parabolic dish might be a better antenna if you can buy it with a feed for your frequency, but it is a lot harder to build than the simple horn shown.
@@stargazer7644 Sorry, my mistake, "A WIFI-yagi comes at about 20 US$ and will beat the horn hands down" is surely not correct. *But,* the typical DIY horns shown for 21cm reception have an aperture of only about 50 * 50 cm and could be easily equalled by a reasonalbly compact DIY yagi if you adapt a 23 cm design. As to a dish, they can be found from surplus in one way or another and the feed is not much different from the feed you need for a pyramidal horn.
Hi , Any radio wave dish telescope which come under 1000 dollar which can be purchased online in USA. I live in India.
It is called a satellite dish. Surely they sell them in India?
@@stargazer7644 can you suggest any which can be used for space navigation
Get a satellite dish and make one with some batteries and a signal finder
#POW DOPPLER SHIFT MEASUREMENTS = you
It's ok if you can use the natural background.