An early pioneer of radio astronomy was Grote Reber, an amateur astronomer who constructed the first purpose built radio telescope in the late 1930s to follow up on the discovery of radio wavelength emissions from space by Karl Jansky.

Non-visual amateur astronomy includes the use of infrared filters on conventional telescopes, and also the use of radio telescopes.

Some amateur astronomers use home-made radio telescopes, while others use radio telescopes that were originally built for astronomy research but have since been made available for use by amateurs.

This is single-sideband modulation, widely used in amateur radio and other communications applications.

W7ASU is an amateur radio station that was first organized in 1935.

W7ASU has about 30 members that enjoy amateur radio, and is primarily a contesting club.

Many SysOps were transplants of the amateur radio community and thus amateur and packet radio were often popular topics.

Representatives from the agency visit the island on average once every two years, often coordinating transportation with amateur radio operators or the U. S. Coast Guard to defray the high cost of logistical support required to visit this remote atoll.

In addition, Tony England became the second amateur radio operator to transmit from space during the mission.

There have been infrequent scientific and amateur radio expeditions, and in 1978 Jacques-Yves Cousteau visited with his team of divers, plus a survivor from the 1917 evacuation, to film a television special called Clipperton: The Island that Time Forgot.

As many other astronauts, also Coleman holds an amateur radio license ( callsign: KC5ZTH ).

In some areas the communications may be by amateur radio, FRS, GMRS or MURS radio, dedicated telephone or fire-alarm networks.

Up to 25, 000 amateur radio operators attend this convention.

The ten attendees were conference organiser Peter Pearman, Frank Drake, Philip Morrison, businessman and radio amateur Dana Atchley, chemist Melvin Calvin, astronomer Su-Shu Huang, neuroscientist John C. Lilly, inventor Barney Oliver, astronomer Carl Sagan and radio astronomer Otto Struve.

Each year for Gibraltar National Week amateur radio operators can use the ZG prefix instead of ZB.

" Gitmo " has a U. S. amateur radio call sign series, KG4 followed by two letters.

Representatives from the agency visit the island on average once every two years, often coordinating transportation with amateur radio operators or the U. S. Coast Guard to defray the high cost of logistical support required to visit this remote atoll.

The " Powerhouses ", as they were known, carried a wider range of products than the smaller DSE stores, especially in the computing, audio-visual and amateur radio areas, and introduced Music to the range.

Dragonboats are the basis of the team paddling sport of dragon boat racing an amateur watersport which has its roots in an ancient folk ritual of contending villagers held over the past 2000 years throughout southern China.

For two years as a child, he lived on a boat for five months of the year as his father was a part-time amateur marlin fisherman.

A few boats are still amateur built, and one amateur-built boat won the National Championship in both 2002 and 2005 ( and is still regularly winning in top flight competition ), while another amateur-built boat came second in the 2006 World Championship.

* A site for the home boat builder with a global reach, for amateur boat builders from around the world.

That first Seafair featured parades, boat races on Green Lake, amateur athletic events, royalty, community festivals like West Seattle Hi-Yu Days, Rainier District Pow-wow, Wallingford Pirate Days, the University District Kid ’ s Parade, and the Ballard Festival, and were highlighted by the nightly Aqua Follies performances.

Auxiliarists who own a boat, aircraft or radio station ( amateur or marine band VHF sets ) often use their equipment ( i. e., " vessels ") on behalf of the USCG and are reimbursed for expenses incurred while under mission orders, although membership does not require ownership of a vessel.

In recent times, the history and iconic look of banks dories have made them popular for amateur boat builders and some recreational boaters

The boat being small and easily transported on roads, is suitable for amateur use.

The boat was suitable for amateur production.

Fishing cannot be done from any boat without a license, even if you're an amateur.

As a strict one-design boat the Laser 2 is not available for amateur construction ; the boat has also been discontinued as a result of the 2007 merger of its manufacturers Laser UK and Vanguard Sailboats into Laser Performance.

This results in quicker construction and less requirement for skilled craftsmanship, and has proved appealing to amateur boat builders.

* Thomas Harrison Butler ( 1871 – 1945 ), British ophthalmologist and amateur boat designer

"; Best in Show, in which he portrayed " Buck Laughlin ," a dog show announcer who offered up an unending stream of bad jokes and off-color comments ; Waiting for Guffman, in which he played " Ron Albertson ," a travel agent who performs in amateur stage productions with his wife ; This Is Spinal Tap, in which he played a lieutenant on the military base where Spinal Tap play ; and For Your Consideration as an obnoxious entertainment television show anchor.

What evidence is available would seem to indicate that Brooks, unlike his older brother Henry, had most of the methodological vices usually found in the amateur.

At the head of the CDC is an unorthodox, 39-year-old amateur politico, Thomas B. Carvey Jr., whose normal profession is helping develop Hughes Aircraft's moon missiles.

The outlook for the amateur, for instance, is usually dependent on his fondness for local history or for the picturesque.

The amateur is closely related to the collector, who is actually no more than the amateur who has taken to the field.

And so well is such ignorance preserved by the amateur and the money-maker that even at the college level most of the hundred-odd folklore courses given in the United States survive on sentiment and nationalism alone.

Even though scientific research is not their main goal, many amateur astronomers make a contribution to astronomy by monitoring variable stars, tracking asteroids and discovering transient objects, such as comets.

The typical amateur astronomer is one who does not depend on the field of astronomy as a primary source of income or support, and does not have a professional degree or advanced academic training in the subject.

Amateur astronomy is usually associated with viewing the night sky when most celestial objects and events are visible, but sometimes amateur astronomers also operate during the day for events such as sunspots and solar eclipses.

It is only within about the past century, however, that amateur astronomy has become an activity clearly distinguished from professional astronomy, and other related activities.

The image is the combination of the 2. 2-metre MPG / ESO telescope of the La Silla Observatory in Chile and a 0. 4-meter amateur telescope.

Commercial telescopes are available new and used, but in some places it is also common for amateur astronomers to build ( or commission the building of ) their own custom telescope.

Although specialized and experienced amateur astronomers tend to acquire more specialized and more powerful equipment over time, relatively simple equipment is often preferred for certain tasks.

A range of astronomy software is available and used by amateur astronomers, including software that generates maps of the sky, software to assist with astrophotography, observation scheduling software, and software to perform various calculations pertaining to astronomical phenomena.

The Internet is an essential tool of amateur astronomers.

Star hopping is a method often used by amateur astronomers with low-tech equipment such as binoculars or a manually driven telescope.

With the development of fast Internet in the last part of the 20th century along with advances in computer controlled telescope mounts and CCD cameras ' Remote Telescope ' astronomy is now a viable means for amateur astronomers not aligned with major telescope facilities to partake in research and deep sky imaging.

Scientific research is most often not the main goal for many amateur astronomers, unlike professional astronomy.

A relatively recent role for amateur astronomers is searching for overlooked phenomena ( e. g., Kreutz Sungrazers ) in the vast libraries of digital images and other data captured by Earth and space based observatories, much of which is available over the Internet.

There is a large number of amateur astronomical societies around the world that serve as a meeting point for those interested in amateur astronomy, whether they be people who are actively interested in observing or " armchair astronomers " who may simply be interested in the topic.