A Bandpass Filter Pulls In The Signals

A hobbyist project called SignalSurge tackles the problem of nearby FM broadcast transmitters overloading amateur radio receivers tuned to the 2 metre and 70 centimetre bands. The open-source PCB design includes bandpass filters, a low-noise preamplifier, and relays for switching between receive and transmit, all controlled via logic-level signals. The surface-mount board features careful RF-aware routing, offering a more polished alternative to homemade Manhattan-style filters.

Why read it: Đọc bài này để hiểu cách thiết kế một bộ lọc băng thông hiệu quả với PCB mở nguồn, giúp phân tách tín hiệu FM gần bên khỏi các thiết bị thu radio chuyên dụng, giúp cải thiện chất lượng tín hiệu cho các dự án ham radio cá nhân.

Source: https://hackaday.com/2026/09/20/a-bandpass-filter-pulls-in-the-signals. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.