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Off topic balun question
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Paul Logan
Hi John,
Im familiar with your excellent articles on balun fabrication and in fact have been using them as a reference for ages. I was just wondering what cores are used in commercial rx baluns which claim to cover long wave up through HF. Any ideas anyone?. bjohnorcas@... wrote:
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bjohnorcas@...
Paul,
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I'm outta town for the weekend and away from references. However, from memory, there really isn't one formulation of ferrite that will work at OPTIMALLY at Longwave up through 30 MHz. Generally, Bill Bowers and I shot for really good performance from 5 MHz. down. The problem tends to be at the lower frequencies, where performance can drop off like it was shot. My impression is that upper frequency performance is much more forgiving. I believe that there are two impedance matcher articles on dxing.info. Be sure that you are reading the latter one, if you only read one. John B., Hi Paul:
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satya@...
Hi Paul:
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Our own John Bryant wrote the book on these! Look to www.dxing.info/equipment/impedance_matching_bryant.doc and www.dxing.info/equipment/impedance_transformer_bryant2.doc for the scoop on baluns Kevin S. Bainbridge Island, WA Hi all, |
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Paul Logan
Hi all,
I know this is off topic but was wondering can anyone suggest a suitable ferrite core for general listening from long wave up to 30 mhz - does such a core exist?. I found a T 200 - 2 in my junk box but when I worked out the turns needed to cover 1 - 30 mhz it was something crazy. Any suggestions for something useful for this one?. regards Paul Logan, Lisnaskea, N. Ireland Listening Homepage: http://geocities.com/yogi540/ Photos: http://www.flickr.com/photos/radiofotos/ Video: http://www.youtube.com/user/yogi540 Send instant messages to your online friends http://uk.messenger.yahoo.com |
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