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#11
March 15th 06, 05:56 AM
posted to rec.radio.amateur.antenna
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Current through coils
K7ITM wrote:
John P. wrote, "A network analyzer is way beyond my budget." Though I'd love for you to buy a nice new Agilent Vector Network Analyzer, I have to say that for things up through low VHF at least, the very economical project at http://users.adelphia.net/~n2pk/index.html is well worth looking at. The performance, when properly calibrated, needs no apologies, for sure. Paul is one of the Good Guys in ham radio, and not just for making this project available. One of Tom's links probably won't work for you, but I'd highly recommend some of the ap notes you can find after a somewhat diligent search. I'm sorry to say that the search engine on the Agilent web site is a poor relative of Google, but you should be able to find these two ap notes the Agilent AN 1287-1: Understanding the Fundamental Principles of Vector Network Analysis Agilent 1291-1B: 10 Hints for Making Better Network Analysis Measurements. They are in PDF files, and I just saved a copy of each...just in case you can't find them. A Google search on phrases like "network analysis application note" and "VNA application note" should yield some interesting things. Here's one thing I found, which has links to others: http://na.tm.agilent.com/vnahelp/appnotes.html Finally, there is an old HP ap note on S-parameters that you should try to find. It _may_ be on the Agilent web site, but if not, a Google search will probably turn it up. Though a Vector Network Analyzer does not necessarily have to do S-parameter measurements, the 8753 is set up to do them as its fundamental measurement, and they are generally useful in making higher frequency measurements, since the standard methodology in the industry is to use S parameters to characterize both passive and active devices. If you look at network analyzers on eBay, you may see ones offered without the S-parameter test set, and you can find the S-parameter test sets offered separately; that's all fine so long as you understand what you are looking at. Thank you for all this useful information. |
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