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Investigating Mystery Notches in Double-Tuned Circuits #hamradio #hamr

David Rowe was getting notches in his double-tuned filter signals, so he decided to investigate, and publish his results. I’m especially giddy with this line:

Physically, this is parasitic capacitance coupling across the air gap between the coils.

uhf_dtc

uhf_bpf_notch

Read more.


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