https://github.com/andriy-bilynskyy/hf-bpf

Short wave BPF HW design
https://github.com/andriy-bilynskyy/hf-bpf

bpf hf hw

Last synced: 2 months ago
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Short wave BPF HW design

• Host: GitHub
• URL: https://github.com/andriy-bilynskyy/hf-bpf
• Owner: andriy-bilynskyy
• License: mit
• Created: 2020-02-13T12:49:28.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2021-11-12T08:57:13.000Z (about 3 years ago)
• Last Synced: 2023-07-02T08:37:23.879Z (over 1 year ago)
• Topics: bpf, hf, hw
• Language: AGS Script
• Size: 170 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Short wave BPF

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.

## Folder structure

- **HF-BPF.asc** - LTspice simulation.  https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html

- **HF-BPF.pro** - KiCad project. https://kicad.org/

- **HF-BPF.sch** - KiCad schematic.

- **HF-BPF.kicad_pcb** - KiCad PCB.

- **HF-BPF.net** - KiCad net-list file.

- **Manufacture** - Gerber files for PCB manufacturing. PCB manufacture https://www.elecrow.com/pcb-manufacturing.html

# Amplitude-frequency characteristic

![Amplitude-frequency characteristic](HF-BPF.jpeg  "Amplitude-frequency characteristic")