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Query: tunable band pass filter

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Technical Reference > Filters

Tunable BandPass Filter — YU1LM

A homemade tunable bandpass filter for all HF bands from 160m to 10m
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Technical Reference > Receivers

Designing a Modular DC Receiver with Tunable Preselector for HF Listening — AA7EE

This project details the development of a modular direct conversion (DC) receiver designed for experimental flexibility in amateur radio and HF signal listening. The mainframe integrates a diplexer, DBM, and AF amplifier, supporting interchangeable local oscillator and antenna filtering setups. A tunable passive HF preselector complements QRP Labs bandpass filters for enhanced signal reception. Utilizing a NanoVNA for precise tuning, the receiver achieves improved signal-to-noise ratios across amateur and non-amateur bands, making it a versatile platform for further RF experimentation.