Simple, effective preselector
Posted: Sun May 19, 2024 12:11 pm
The schematic is here
http://ve2azx.net/technical/FMT/L-C_FilterSchematic.pdf
the inductors are molded ones, that is "nothing to wind", the variable capacitor can be a "plastic polyvaricon", so it's simple to build, now... look at the response curve, a nice "bell" with pretty steep shaped sides; add it in front of a wideband LNA and you'll have a nice "tuned" preamp
http://ve2azx.net/technical/FMT/L-C_FilterSchematic.pdf
the inductors are molded ones, that is "nothing to wind", the variable capacitor can be a "plastic polyvaricon", so it's simple to build, now... look at the response curve, a nice "bell" with pretty steep shaped sides; add it in front of a wideband LNA and you'll have a nice "tuned" preamp