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Amateur Radio, Tech Insights and Product Reviews

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Stub and filter calculator
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Understanding Quarter-Wave Stubs Made Easy: An Interactive Tool for Every Ham

9M2PJU November 27, 2025

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

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amateur radio android CW digital signal processing dsp filter hamradio morse code
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DSP Audio Filter For Android

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

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May 14, 2012
amateur radio antenna emi filter high frequency magnetic power radiation radio receiver source switching mode power supply transceiver
9M2PJU 0 Comments

Switching Mode Power Supply (SMPS) Interference

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

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November 20, 2011
amateur radio duplexer filter homebrew radio frequency repeater VHF
9M2PJU 0 Comments

Duplexer

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

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June 20, 2011
amateur radio cavity duplexer filter VHF
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What Is Cavity Filter

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

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June 20, 2011

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  23. https://qsomap.hamradio.my

9M2PJU Google Chrome Extensions:

  1. 9M2PJU Malaysian Ham Radio Callsign Search
  2. 9M2PJU APRS Pass Code Generator
  3. 9M2PJU Watt to dBm Converter
  4. 9M2PJU Ohm's Law Calculator
  5. 9M2PJU Grid Locator Finder
  6. 9M2PJU Dipole Antenna Calculator
  7. 9M2PJU Resonance Calculator
  8. 9M2PJU IPv4 Calculator
  9. 9M2PJU Classic Cipher Tool
  10. 9M2PJU Mils To Degrees Converter
  11. 9M2PJU Islamic Prayer Times
  12. 9M2PJU Easy Recipe Finder
  13. 9M2PJU Drain Calculator
  14. 9M2PJU SWR Calculator
  15. 9M2PJU Quran Verse of the Day
  16. 9M2PJU Enigma Machine Simulator
  17. 9M2PJU Recharge Calculator
  18. 9M2PJU Malaysia Electricity Calculator
  19. 9M2PJU Text To Morse Code Converter
  20. 9M2PJU RSA Key Generator

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