20.500.12556/RUL-88901 Radioteleskop za vodikovo črto 21cm Radiotelescope for the 21cm Hydrogen Spectral Line Radioteleskop je naprava za merjenje moči, spektra in polarizacije elektromagnetnega sevanja, ki ga oddajo nebesni izvori v področju radijski valov. Radijski signali so šibkejši kot vidna svetloba. Velika valovna dolžina radijskega sevanja zahteva velik radioteleskop za primerljivo prostorsko ločljivost.S skrbnim načrtovanjem in izdelavo nizkošumnega ojačevalnika, pasovnega sita in žarilca za parabolično zrcalo nam je uspelo izdelati radioteleskop šumno temperaturo sistema 60K v frekvenčnem pasu 1.42GHz. V radioteleskopu smo uporabili ceneno tržno zrcalo premera 3m za satelitsko televizijo in pripadajoči vrtiljak azimut-elevacija. Signal smo obdelali s cenenim DVB-T ključkom in prosto dostopno programsko opremo na prenosnem osebnem računalniku. S ceneno elektroniko in majhno anteno smo opazovali sevanje nevtralnega vodika v naši galaksiji Rimski cesti. Iz meritev je razvidno, da ima Rimska cesta številne krake spiralne oblike. A radio-telescope measures the power, frequency spectrum and polarization of celestial sources in the radio-frequency range. In the radio-frequency range the signals from celestial sources are weaker than in the visible light. The large wavelength of radio waves requires a large radio-telescope for a comparable spatial resolution. With a careful design and manufacturing of a low-noise amplifier, a band- pass filter and a parabolic-dish primary feed we obtained a radio-telescope with a system noise temperature of 60K in the 1.42GHz frequency range. In the radio-telescope we employed an inexpensive commercial parabolic mirror of 3m diameter intended for satellite TV reception and corresponding azimuth-elevation antenna positioner. We processed the signals with an inexpensive DVB-T receiver (USB dongle) and free software running on a portable personal computer. With inexpensive electronics and a small antenna we observed the radia- tion of neutral hydrogen in our galaxy Milky way. From our measurements it is evident that Milky way has several spiral arms. čšž radioteleskop LNA pasovno prepustno frekvenčno sito vodikove črte radioastronomija žarilec radiotelescope LNA band-pass filter hydrogen line radioastronomy feed horn true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2017-01-27 10:15:02 2017-01-27 10:15:06 2022-08-09 14:46:39 0000-00-00 00:00:00 2017 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 37061 Saje_Tadeja_-_Radioteleskop_za_vodikovo_crto_21cm.pdf Saje_Tadeja_-_Radioteleskop_za_vodikovo_crto_21cm.pdf 1 59F50D95C2B617204149607A1997D333 42ca2839a69867af9f1932772d8bbbad09e3bf5edbaa43298f75f6aa5841d603 d0b5866a-a1b1-11eb-a523-00155dcfd717 20.500.12556/rul/99a03fd5-882b-4f82-88d6-49d160def425 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=92480 Fakulteta za elektrotehniko 0 0 0