astron
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Antennas : Feed Lines- Transmission Lines
- Whenever you choose a coax feedline, the frequency of operation is a very important consideration. Over the operating bandwidth of the coax the VSWR is low, typically 1.2:1 or better. Insertion loss is also an important parameter. It is usually specified in dB/foot and is a linear relationship.
[ Hits: 1272 | Votes: 0 | Rating: 0 ]
- SWR: Maximum allowable VSWR
- VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools
[ Hits: 1237 | Votes: 3 | Rating: 3.33 ]
- Yagi Element Mounting Considerations
- One of the most important considerations when designing and building a Yagi antenna is the method used to attach the elements to a boom. This is true because the boom influences the electrical length of the elements. In this article JH Reisert explain with drawings techniques on mounting yagi antenna elements to a boom
[ Hits: 4305 | Votes: 2 | Rating: 8.5 ]
- Antenna Selection Made Easy
- This page will help you answer important questions about antenna selection before you talk to a supplier. After reading this paper, you should be able to better determine the most important parameters you need to know for your antenna selection criteria.
[ Hits: 2028 | Votes: 2 | Rating: 3 ]
- The University of Calgary Radio Astronomy Laboratory
- Radio astronomy research at the University of Calgary
[ Hits: 819 | Votes: 0 | Rating: 0 ]
- University of Hawaii Radio Astronomy
- Online receiver streams signals from Jupiter and the sun
[ Hits: 8244 | Votes: 18 | Rating: 5.05 ]
- MOST
- The Molonglo Observatory Synthesis Telescope
[ Hits: 458 | Votes: 0 | Rating: 0 ]
- National Radio Astronomy Observatory
- Research facility of National Science Foundation, operates many radio telescope observatories.
[ Hits: 542 | Votes: 0 | Rating: 0 ]
- The Onsala Space Observatory
- Located 30 miles south of Gothenburg, Sweden
[ Hits: 500 | Votes: 0 | Rating: 0 ]
- The Very Small Array (VSA)
- in Tenerife (Canary Islands). Designed to study fluctuations in the Cosmic Microwave Background (CMB) thought to originate from the period immediately following the big bang. Operated by Cambridge and Manchester Universities (UK).
[ Hits: 962 | Votes: 1 | Rating: 10 ]
- Luxorion ON4SKY website
- Thierry Lombry, LX4SKY (aka ON4SKY) has developped a excellent educational website mainly devoted to amateur astronomy but it includes also a large section dealing with amateur radio activities includes several interesting pages about radio astronomy and SETI
[ Hits: 971 | Votes: 5 | Rating: 9 ]
- Radio Astronomy Supplies
- Supplier of Radio Telescopes and associated equipment since 1994.
[ Hits: 1176 | Votes: 4 | Rating: 8 ]
- GM4JJJ VHF and EME pages
- GM4JJJ, David with EME on 144 MHz and Astronomy.
[ Hits: 1003 | Votes: 2 | Rating: 7.5 ]
- DX Activities of ONL5183
- Whith more than 20 years of ham practicen SWL Thierry LOMBRY, alias ONL5183, has written several technical pages about ham activities, including propagation, radio perturbations, radioastronomy, DXing, QSLing, ham-spirit, review of material and more. This very interesting website is completed by a large French section devoted to amateur astronomy illustrated with vivid colors pictures.
[ Hits: 1054 | Votes: 3 | Rating: 6.33 ]
- Meteor and Colorgramme
- FREE specialized software in the detection and registration of echoes radio products by meteors shower, falling star, at the time of their gone in atmospheric. They are destined to all possessors of a radio and a computer, interested parties by this simple technique of radioastronomy.
[ Hits: 1523 | Votes: 2 | Rating: 8.5 ]
- Home Planet Release 3.1
- Comprehensive astronomy / space / satellite-tracking package for Microsoft Windows 95/98/Me and Windows NT 4.0/2000/XP
[ Hits: 2043 | Votes: 4 | Rating: 10 ]
- Satbuster
- SATBUSTER for Windows is especially designed for satellite visual observers and trackers. Its users, mainly amateur astronomers and radio amateurs, appreciate both the accuracy and the simple to use graphical interface.The software is aimed to hobbysts. However a growing number of plain folks are starting to use this tool to recognize and look at the International Space Station and the Space Shuttle during its missions too
[ Hits: 2397 | Votes: 3 | Rating: 4.67 ]
- GorbTrack
- GorbTrack or Geostationary Orbit Tracker is a freeware program intended to be an aid in finding geostationary satellites. It produces output helpful in aiming dishes for receiving television broadcast satellites. The program also displays several astronomical values like the positions of the sun and moon
[ Hits: 10431 | Votes: 30 | Rating: 6.96 ]
- RF Coaxial Connectors
- RF coax(ial) connectors are a vital link in the radio spectrum. Coax connectors are often used to interface two units such as the antenna to a transmission line, a receiver or a transmitter. The proper choice of a coax connector will facilitate this interface.
[ Hits: 4329 | Votes: 0 | Rating: 0 ]
- About Lightning Protection
- What You Should Know About Lightning Protection
by Joseph H. Reisert
[ Hits: 3117 | Votes: 1 | Rating: 8 ]
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