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Cassegrain Antenna Development
On Thu, 09 Apr 2009 10:01:32 +0200, Emanuele Colucci
wrote: well, searching for "cassegrain antenna" with google only gives 60,400 links, searching for "cassegrain antenna design and construction" narrows it down to about 4000. It's April, 9th, 2009. By this date I still wonder why there are persons so arrogant to think that who asks for advices never looked at google. Hi Emanuele, This is probably due to the way the question was offered. You want a complete solution to an unknown problem. When such "wish lists" are posted here, they obtain one of several results: 1. An exhaustive reply that is complete to the question asked, but we then have the luxury of reading from the original poster that "that specific solution won't work because...." 2. The beginning of an exhaustive series of postings to draw the specific issues out of the original poster. That has already begun by another poster in this thread. 3. The fire hose is opened (much as above) which is another form of (2) in that you imply you have done a google search, but you haven't expressed what your search terms were - which would, of course, reduce those 60,400 links to something more tractable. You don't offer anything like this in your response except outrage. Each of these possible outcomes inevitable returns to you, and something you could have done first instead of last: What is your problem, why do you think this (a "cassegrain antenna") is the solution, and some fundamental design issues such as 1. Frequency; 2. Bandwidth; 3. Match; 4. Gain; 5. Budget (time and/or money); 6. Specific issues (phase control?); 7. Application issues (EME?). When such things are asked for, students coming here to complete an homework assignment are usually stunned. If you are not a student, then an engineer is always prepared to submit the characteristics required. If you are not a student, nor an engineer, then almost any quick answer could lead you down the path to lost time. You are lucky no one supplied that quick answer, because we have enough miracle antenna designers who come here to do just that. 73's Richard Clark, KB7QHC |
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