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41. Arecibo At CEDAR 2003
. Arecibo Participation at the . 2003 CEDAR Workshop . June 15 - 20, 2003 Longmont, CO . Arecibo CEDAR Post-Docs and Tutotials Talks . Arecibo Friends Workshop at CEDAR 2003 . Return to Pictures Homepage . Return to SAS Homepage
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Ссылки http://www.naic.edu/aisr/sas/Cedar2003/AO-Cedar03.html -- 8.2 Кб -- 25.06.2003
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42. Space and Atmospheric Science Menu
. Space and Atmospheric Sciences Links . Instruments Links: . Incoherent Scatter . 430 MHz Transmitter . Lidar . Optical Instruments . rf Interactions . Database Links: . Aeronomy Database . GPS TEC Data . Ionosonde Data . Online Monitor . SAS Staff: . Who is Who . Publications Listing . SAS Pictures . Back to Main Menu
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Ссылки http://www.naic.edu/aisr/sas/menuframe.html -- 4.7 Кб -- 19.02.2006
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43. Space and Atmospheric Science Homepage
.
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Ссылки http://www.naic.edu/aisr/sas/sashomeframe.html -- 1.7 Кб -- 16.02.2010
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44. SAS Picture Index
. Radar Meteor Workshop March 2003 . Arecibo At The 2003 CEDAR Workshop . Back To SAS Homepage
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Ссылки http://www.naic.edu/aisr/sas/saspicture.html -- 1.6 Кб -- 08.08.2003
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45. Space and Atmospheric Science Homepage Welcome
Welcome to the . The NAIC enables research in the areas of astronomy, planetary studies, and space and atmospheric sciences by providing unique capabilities and state-of-the-art instrumentation for data collection and analysis, together with logistical support to users. ... Use of the Arecibo Observatory is available on an equal, competitive basis to all scientists from throughout the world to pursue research in astronomy, planetary studies and space and atmospheric sciences. ...
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Ссылки http://www.naic.edu/aisr/sas/saswelcome.html -- 3.9 Кб -- 16.02.2010
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46. Welcome to Adobe GoLive 6
Harmonic Filter, Antenna Tuner and Waveguide . A high-power "waffle-iron" or muffler type" waveguide filter provides dissipative attenuation for any power at the second and higher harmonics. ... The harmonic filter is followed by an antenna tuner in the form of a waveguide magic-T hybrid with motor-driven stubs on two of its four ports. ... The tuner is followed by 1,500 ft. of WR2100 waveguide that run from the control building to the platform. ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-harmonic.html -- 2.9 Кб -- 11.08.2003
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47. Description
High Voltage Power Supply . An adjustable power supply furnishes up to 120 kV at 4.4 . The voltage charges the 37.2 F capacitor bank. When the transmitter is pulsed, the klystron pull high current from the capacitor bank. The power supply is behind a locked door in the high voltage vault. Crowbar . The Crowbar circuit provides path by which nearly all the charge in teh capacitor back can be dumped to ground, rather than through an arc inside one on the klystrons. ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-high.html -- 2.6 Кб -- 11.08.2003
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48. How to does the Transmitter Work?
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-home.html -- 1.4 Кб -- 11.08.2003
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49. Introduction
The Arecibo Observatory Transmitter . The purpose of the web page is to inform you of the capabilities of the 430 MHz Arecibo Transmitter and its related parts that are of invaluable help in the recollection of Atmospheric Data. This information is taken from the Arecibo 430 MHz Radar System Operation and Maintenace Manual written by Jon Hagen on April 2001. ... The transmitter operates at a fixed center frequency of 430 MHz with a maximum transmitted bandwidth of 1 MHz. ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-intro.html -- 3.3 Кб -- 11.08.2003
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50. Welcome to Adobe GoLive 6
Intermediate Power Amplifier (IPA) . The IPA uses a single Eimac 3KM3000LA external cavity klystron and is capable of producing a peak power of 20 kW or an average power of 1 kW. ... The required drive power is only about 790 watts, so the IPA is rated very conservatively and has been one of the most reliable parts of the transmitter. ... Its output is pulsed only because the exciter gates the input signal on and off. ... The IPA signal reaches the PA by way of a 1.5" coaxial transmission line. ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-ipa.html -- 2.5 Кб -- 11.08.2003
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51. Klystron
... The L-3403 Klystron is a four-cavity, modulating anode, pulsed klystron amplifier which can be mechanically tuned to amply any frequency within the range from 400 to 450 MHz. The tube will produce a peak power output of 1.25 MW at an average RF power output of 75 kW at a 0.06 duty factor with a minimum power gain of 35 dB. ... When the proper voltages are applied to the tube, a beam off electrons is formed at the cathode end of the tube and travels axially though the tube to the collector. ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-klystron.html -- 3.3 Кб -- 11.08.2003
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52. How does the Transmitter Work?
. How does the Transmitter Work? . Introduction . Transmitter Specifications . Description: . RF Circuitry . Timing Generator . Exciter . Intermediate Power Amplifier . Power Amplifier . Harmonic Filter, Antenna Tuner and Waveguide . Platform RF Components . High Voltage Power Supply . Crowbar . Control Room . Klystrons . Back To . SAS Homepage .
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-menu.html -- 4.0 Кб -- 14.08.2003
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53. Welcome to Adobe GoLive 6
Power Amplifier (PA) . Two klystrons operate in parallel as a balanced amplifier with a coax power divider at the input and a waveguide 90 hybrid combiner at the output. ... Nominally there should be no power dissipated in the waster if the trombone section is adjusted correctly but, if the two klystrons do not have identical output power, some wasted power is inevitable. ... Beam pulsing is done by means of a "mod anode" control element built into each klystron. ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-pa.html -- 5.2 Кб -- 11.08.2003
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54. Welcome to Adobe GoLive 6
... The waveguide passes through a rotary joint at the top center of the azimuth arm. It then proceed down to the bottom of the arm to the continuously adjustable two-way power divider. One output of the divider supplies power to the carriage house while the other output supplies power to the Gregorian dome. ... Power from the collector enters the carriage house though a length of corrugated waveguide and is connected to a turnstile junction. ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-platform.html -- 3.6 Кб -- 11.08.2003
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55. Transmitter Specification
... Center Frequency: 420 MHz (adjustable from 425 to 435 MHz) . ... Maximum instantaneous bandwidth: 2 MHz . Maximum Peak Power at transmitter output: 2.5 kW . Maximum Avg. Power at transmitter output: 150 kW . Maximum beam duty cycle: 6 % . ... Maximum PRF: 1 kHz . Maximum pulse length: 2.1 msec . Minimum pulse length: 2 sec . ... Power output variation: less than 0.2 dB pulse to pulse after 15 minutes warm up . ... Output power adjustability: continuously adjustable to ~20 dB . ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-specs.html -- 3.8 Кб -- 11.08.2003
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56. Welcome to Adobe GoLive 6
Timing Generator . For testing purposes, this unit in the control console can generate the four pulses needed to control the transmitter: the receiver protection command, the beam on command, the rf on command and the rf phase command. But normally these commands are generated by a programmable pulse generator that is part of the computer data-taking interface. The program-generated pulses enter the timing generator as "Request pulses." ... Exciter . ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans-timing.html -- 2.9 Кб -- 11.08.2003
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57. Welcome to Adobe GoLive 6
Control Room . Transmitter Console . The console at the Control Room is where all the parts of the 430 MHz Transmitter are controlled. Operating the transmitter is very simple, it consist of turning on the Intermediate Power Amplifier (IPA) and Power Amplifier (PA) Systems , and wait for approximately 15 minutes for the IPA High Voltage (HV) and PA HV to be ready. ... Racks . With the equipment of this racks various operations are performed. ...
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Ссылки http://www.naic.edu/aisr/sas/transmitter/trans_control.html -- 3.5 Кб -- 14.08.2003
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58. Carlos A. Vargas Alvarez Information
Carlos A. Vargas lvarez . ... Tel. (787) 878 - 2612 ext. ... Fax (787) 878 - 1861 . Born on 1977 in Arecibo, Puerto Rico. ... Joined Arecibo Observatory scientific staff in July 2002 has a Data Analyst for the Radar Division of the Space and Atmospheric Science Department . ... BS from the University of Puerto Rico-Mayag ez Physics on 2002 . ... Development of MatLab routines for calibration and vizulalization of Radar Data. Calibration and Analysis of Topside Data and World Day Experiments. ...
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Ссылки http://www.naic.edu/aisr/sas/who/carlos.html -- 2.9 Кб -- 08.08.2003
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59. Christiano Brum Information
Christiano Garnett Marques Brum . ... 2011-Present: Assistant Director of Space and Atmospheric Science, Arecibo Observatory, Arecibo, Puerto Rico. 2007-2011: Post-Doctoral Research Associate,Topside Ionosphere, Arecibo Observatory, Arecibo, Puerto Rico. ... Participation as researcher in 7 Brazilian Antarctic Expeditions: 03/2007 - 07/2007 - XXIV Brazilian Antarctic Expedition (GPS Project ). 01/2006 - 02/2006 - XXIII Brazilian Antarctic Expedition (Meteorology Project). ...
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Ссылки http://www.naic.edu/aisr/sas/who/christiano.html -- 5.0 Кб -- 22.11.2011
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60. Craig Tepley Information
. Craig Tepley . e-mail address: craig@naic.edu . Tel. (787) 878 - 2612 ext. 257 . Fax (787) 878 - 1861 . Professional Development . 19??-Present: Senior Research Associate - Head of Optical Sciences . Educational Background . Case Western Reserve University, Cleveland, Ohio . Research interests: . Lower and upper atmospheric studies using lidar. Professional Membership . IEEE . OSA . AGU . AARP . List of Publications
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Ссылки http://www.naic.edu/aisr/sas/who/craig.html -- 2.7 Кб -- 14.02.2008
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