hf preselector

.Here is a schematic and a frequency plot of a high performance tracking filter based input stage suitable for the high performance software defined radios . The noise figure is less the 10 dB and the FET guarantees low IMD products.

73 de Ulrich

I?m sorry, maybe I missed the point. What is special at this circuit?

The high Q operation, (very narrow RF bandwidth, and low noise figure, Large signal data to follow