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#12
June 2nd 07, 11:28 PM
posted to rec.radio.amateur.antenna
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Trying to find out what Ferrite material this is.
Cecil Moore wrote in news:9pf8i.10153$4Y.6557
@newssvr19.news.prodigy.net: wrote: All I want to know is if the toroids would be any good for HF 1:1 baluns. An antenna analyzer, like the MFJ-259B, is a very useful piece of test equipment for all types of measurements of this kind. Using the MFJ-259B, I .... The '259B is no doubt a handy device, but very limited for measuring components. Have you tried to measure at an inductance that has more than 250 ohms of reactance at some frequency of interest? Have you tried to explore self resonance of a coil..., invariably it runs into the same problem of inductive reactance going off scale way below the point at which self resonance bites in. When talking about ferrite or powdered iron cored inductors of reactance over 200 ohms, where mu is frequency dependent and flux dependent, I find the '259B nearly useless. Owen |
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