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This interesting circuit is a combined tunable BPF and LPF. The idea of this is to get rid of the separate BPFs in the receiver and the separate LPFs in the transmitter by putting this in instead and tuning it as necessary. It does actually work. The shape for the BPF on receive is great and the attenuation of harmonics is very good on transmit. Good enough for on air use! 

Category: Homebrew electronics
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