Slika:Horn Antenna-in Holmdel, New Jersey.jpeg

Vsebina strani ni podprta v drugih jezikih.
Iz Wikipedije, proste enciklopedije

Izvorna datoteka(2.793 × 2.197 točk, velikost datoteke: 597 KB, MIME-vrsta: image/jpeg)


To je slika kraja ali stavbe z vnosom v Državnem registru zgodovinskih krajev Združenih držav Amerike. Sklicna številka je 89002457..

Povzetek

Opis
English: The 15 meter Holmdel horn antenna at Bell Telephone Laboratories in Holmdel, New Jersey was built in 1959 for pioneering work in communication satellites for the NASA ECHO I. The antenna was 50 feet in length and the entire structure weighed about 18 tons. It was composed of aluminum with a steel base. It was used to detect radio waves that bounced off Project ECHO balloon satellites. The horn was later modified to work with the Telstar Communication Satellite frequencies as a receiver for broadcast signals from the satellite. In 1964, radio astronomers Robert Wilson and Arno Penzias discovered the cosmic microwave background radiation with it, for which they were awarded the 1978 Nobel prize in physics. In 1990 the horn was dedicated to the National Park Service as a National Historic Landmark.
This type of antenna is called a Hogg or horn-reflector antenna, invented by Albert Beck and Harald Friis in 1941 and further developed by D. C. Hogg at Bell Labs in 1961. It consists of a flaring metal horn with a reflector mounted in the mouth at a 45° angle, so the antenna receives radio waves at a 90° angle to the horn axis. The reflector is a segment of a parabolic reflector, so the antenna is equivalent to a parabolic antenna fed off-axis. This type of antenna has characteristics that make it a good radio telescope: it has very broad bandwidth, the aperture efficiency can be calculated accurately, and the horn shields the antenna from electrical noise coming from angles outside the beam axis, so it picks up little thermal ground noise.
Datum
Vir Flickr: NASA on The Commons
Original source: Archive1, Archive 2
Avtor NASA
Dovoljenje
(Nadaljnja uporaba datoteke)
Public domain Ta datoteka je v javni domeni, ker jo je izdelala izključno NASA. Avtorskopravna politika NASE pravi, da »Gradivo NASE ni zaščiteno z avtorskimi pravicami, razen če je rečeno drugače.« (glej Template:PD-USGov, stran z avtorskopravno politiko NASE ali Politiko uporabe slik JPL.)
Opozorila:
Druge različice
Lokacija objekta40° 23′ 29″ S, 74° 11′ 07″ Z Kartographer map based on OpenStreetMap.Ta in druge slike po lokaciji: OpenStreetMapinfo
To sliko ali ta video je katalogiziral NASA Headquarters Nacionalne uprave za aeronavtiko in vesolje (NASA) Združenih držav Amerike pod oznako fotografije: GPN-2003-00013 in druga oznaka: 62-Tels-20.

Ta predloga ne označuje avtorskopravnega stanja dela. Ob njej mora stati tudi običajna oznaka avtorskopravnega stanja gradiva. Glejte Commons:Navedba licence.
Drugi jeziki:

Napisi

Dodajte enovrstični opis, kaj ta datoteka predstavlja

Predmeti, prikazani v tej datoteki

motiv

Holmdel Horn Antenna angleščina

junij 1962

40°23'29.000"N, 74°11'7.001"W

image/jpeg

Zgodovina datoteke

Kliknite datum in čas za ogled datoteke, ki je bila takrat naložena.

Datum in časSličicaVelikostUporabnikKomentar
trenutno20:38, 26. april 2020Sličica za različico z datumom 20:38, 26. april 20202.793 × 2.197 (597 KB)BammeskLarger file size version (596 KB) from "NASA on The Commons" at flickr.com
02:03, 10. april 2009Sličica za različico z datumom 02:03, 10. april 20092.793 × 2.197 (422 KB)BotMultichillT{{Information |Description={{en|1=The Horn reflector antenna at Bell Telephone Laboratories in Holmdel, New Jersey was built in 1959 for pioneering work in communication satellites for the NASA ECHO I. The antenna was 50 feet in length and the entire stru

Datoteka je del naslednje 1 strani slovenske Wikipedije (strani drugih projektov niso navedene):

Globalna uporaba datoteke

To datoteko uporabljajo tudi naslednji vikiji:

Metapodatki