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.

IRCs are often used by amateur radio operators sending QSL cards to each other ; it has traditionally been considered good practice and common courtesy to include an IRC when writing to a foreign operator and expecting a reply by mail.

Rajiv Gandhi was an active amateur radio operator, and used the callsign VU2RG.

Holland was an amateur radio operator and held the callsign DB4FA.

LeMay was an active amateur radio operator and held a succession of call signs ; K0GRL, K4FRA, and W6EZV.

* A first person account from an amateur radio operator who got a full tour of the HAARP site.

Hussein was an avid amateur radio operator and an Honorary Member of the Radio Society of Harrow ( callsign JY1 ).

Following a proposal devoped by Lt Col Adrian Simpson that a small number of stations located around Britain would not work, the task of developing a comprehensive listening organization was given to Ralph Mansfield, 4th Baron Sandhurst, an enthusiastic amateur radio operator who had served with the Royal Engineers Signal Service during World War I, and had been commissioned as a Major in the Royal Corps of Signals in 1939.

On February 9, 1928, Hartsdale became the birthplace of the American " Couch Potato " when the Scottish inventor John Logie Baird ( 1888 – 1946 ) transmitted the world's first inter-continental short-wave television signal from a transmitter ( call sign 2KZ ) in Coulsdon, Surrey ( a suburb of London ) to his colleague O. G. Hutchinson in the cellar of Robert M. Hart, an amateur radio operator ( call sign 2CVJ ) in Hartsdale.

A physician, Brady held the rank of captain in the US Navy, flight surgeon for the Blue Angels Navy flight squadron, an avid amateur radio operator ( N4BQW ) and BSA Eagle Scout.

After graduation, he worked for Reginald Tibbets, a prominent amateur radio operator who operated a business supplying radiation detectors to the government.

A notable case is that of former United States amateur operator Jack Gerritsen operating under the revoked call sign KG6IRO who was successfully prosecuted by the FCC for unlicensed operation and malicious interference.

In addition, Garriott made the first ham radio transmissions by an amateur radio operator in space during the flight.

In the absence of such control or alternative arrangements such as a privatized electromagnetic spectrum, chaos might result if, for example, airlines didn't have specific frequencies to work under and an amateur radio operator were interfering with the pilot's ability to land an aircraft.

His grandson, Tom Kneitel, a prolific writer on electronics and an avid amateur radio operator ( K2AES ), was the founding editor of Popular Communications magazine.

In fact, the cost of cutting edge ( at the time ) UHF radio equipment meant that only the more serious CB operator would use the band, a nice though expensive haven for mature CB operators, and radio hams who didn't like the ' red tape ' of amateur radio.

* Silent key, an amateur radio operator who has died

* Old Man ( meaning a male amateur radio operator )

* Charles Apgar, New Jersey amateur radio operator

Namgyal was an amateur radio operator, callsign AC3PT, and was a highly sought contact on the airwaves.

Art Bell III was always interested in radio and at the age of 13 became a licensed amateur radio operator.

Bell became a licensed amateur radio operator at the age of 13.

According to QRZ. Com, Bell took and passed the Philippines amateur radio exams and became a Philippine Class A amateur radio operator with the call sign of 4F1AB.

Grote Reber ( December 22, 1911 – December 20, 2002 ) was a pioneer of radio astronomy, which combined his interests in amateur radio and amateur astronomy.

After one season at Trinity University, Grote was signed as an amateur free agent by the Houston Colt. 45s in 1962, and was assigned to play for their minor league affiliate, the San Antonio Bullets.