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[Mostly Solved] LC Bandpass Filter Resonates, but with 30-40 dB Insertion Loss

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virtualparticles:
In my humble opinion, you should make your own inductors. Use the formula L (uH) = (R2*N2)/(9*R + 10*L) where R is the coil radius in inches, L is the length of the coil in inches and N is the number of turns. This is surprising accurate and you get Qs on the order of a hundred without too much trouble. You can also spread or squeeze the turns together to "tune" the filter for best performance.

Have fun!  ;D

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