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Old November 16th 07, 09:49 PM posted to rec.radio.amateur.boatanchors
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Default BC-453 IF tuning


"Richard Knoppow" wrote in message
...
It isn't the Q but rather the mutual coupling between primary and

secondary windings. Hammarlund had a patent on this kind of transformer
which it used in the Super-Pro series of receivers. In the Super-Pro two
of the IF transformers have movable coils which are controlled via cams
operated by the selectivity knob on the front.
Richard Knoppow

Los Angeles, CA, USA



Some Silvertone 1930s vintage consumer radios have the same
arrangement.

Pete





 
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