This is HW design of passive shortwave BPF 1.8MHz - 30MHz.
The schematic is based on 1.8MHz 7-th order elliptic HPF and 30MHz 7-th order elliptic LPF.
Input output filter resistance is 50 Ohms.
Loses in band-pass are less than -6.8dB. Loses at 60MHz and more are more than -80 dB. The same situation for frequencies lower than 1MHz - -80dB.
The design is created to use together with SDR receivers due to problematic reception of shot-wave bands in city conditions. This situation is mainly caused by huge noise from different switch power converters/inverters at low frequencies and FM radios at high frequencies.
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HF-BPF.asc - LTspice simulation. https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html
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HF-BPF.pro - KiCad project. https://kicad.org/
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HF-BPF.sch - KiCad schematic.
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HF-BPF.kicad_pcb - KiCad PCB.
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HF-BPF.net - KiCad net-list file.
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Manufacture - Gerber files for PCB manufacturing. PCB manufacture https://www.elecrow.com/pcb-manufacturing.html
