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Sliderule Emulator with Equation Solver

✇AmateurRadio.com
Par :Richard AA4OO

Hemmi/Post 1460 Versalog Slide Rule

A classic slide rule replica implemented in JavaScript. All scales are programmatically drawn from reverse-engineered mathematical equations.

Open in Full Screen →

How to Use

  • Drag the rule or cursor with your mouse
  • Scroll with mouse wheel to zoom in/out
  • Right-click on cursor or scale to enter values:
    • Numbers: 3.14
    • Constants: pi, e
    • Degrees: 2:30:26
  • Use the Equation feature to solve mathematical expressions
  • Toggle Markings and Display options in the control panel

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No RCV Port? No Problem – DXE RTR-1A

✇AmateurRadio.com
Par :Richard AA4OO
The Sweetness of Noise Free CopyI have been using my Receive only Loop on Ground antenna at my station for the past few weeks.  It was connected to my SDR through my receiver protection switch from OK1RP .  That switch protects...

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Licensed Amateurs by State

✇AmateurRadio.com
Par :Richard AA4OO
 How Extra is Your State?My amateur radio license was set to expire early in 2026, so I sat down to navigate the FCC’s renewal process. I don’t recall a separate payment system (CORES) needing to be tethered to an FRN a decade ago, but it’s there ...

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Loop on Ground (LoG) Receive Antenna

✇AmateurRadio.com
Par :Richard AA4OO
Dirt Shark AntennaHow a Humble Wire on the Ground Can Transform Your Radio ListeningEver find yourself locked in a frustrating battle, wrestling with all those fancy knobs and buttons on your shiny radio to bring a signal out of the noise, just to catc...

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