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IF transformer coupling factor...

Hi,

I would like to know why coupling factor for IF transformer affects the centre frequency. I hv a circuit in PSpice with two IF transformers... and when I reduce the coupling factor I get the required centre frequency which is 455KHz...

for both IF transformers

The inductor values are

L1 = 680uH L2 = 97uH

and original coupling factor is 0.9

but after simulations the centre frequency obtained is 451KHz

when the coupling factor is reduced to 0.75 I get the required centre frequency....

anyone with an answer...

John

Reply to
xiibweb
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Just going to point out that the overcoupled response curve is double-humped (two amplitude peaks).

Reply to
Charles Schuler

Hello Charles,

Does that make it a "Camel Filter"?

Regards, Joerg

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Reply to
Joerg

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