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amateur radio amateur radio calculator calculator filter ham radio ham radio thailand radio amatur

9M2PJU November 27, 2025

In RF engineering, quarter-wave stubs are one of the simplest and most powerful tools we…

amateur radio android CW digital signal processing dsp filter hamradio morse code

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The DSP Audio Filter is a tool that enables you to filter frequencies from an…

amateur radio antenna emi filter high frequency magnetic power radiation radio receiver source switching mode power supply transceiver

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1. Why are Switched Mode Power Supplies (SMPS) associated with radio interference? Switched mode power supplies…

amateur radio duplexer filter homebrew radio frequency repeater VHF

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A duplexer is a device that allows bi-directional (duplex) communication over a single channel. In…

amateur radio cavity duplexer filter VHF

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Cavity filters are the basic circuitry behind a Duplexer and are sharply tuned resonant circuit…