February 25th 11, 12:36 PM
posted to rec.radio.amateur.homebrew
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First recorded activity by RadioBanter: Feb 2011
Posts: 3
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Some questions on IF transformers
"Joel Koltner" wrote
1) The really big 450kHz IF transformers you see in tube sets... why did
they wind the coils in the form of "pancakes" rather than "the usual way"
(single-layer coils)? Is it just a consequence of needing lots of turns
(to get enough magnetizing inductance) but, for the coupling coefficient
desired, finding that you'd end up with, e.g,. a foot-long tranformer if
you only used a single layer?
See
http://www.crystal-radio.eu/enkoppelfactor.htm
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