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HamCalc

Developer: 
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HamCalc is a collection of calculators, for radio amateurs, presented as a series of 'Tabbed' pages.
* Antenna ERP calculations.
* Attenuator calculations.
* Audio filter design.
* Coil Winding.
* Decibel calculations.
* Great-Circles map and calculator.
* HF Filters.
* HF Antenna Traps.
* Op-Amps.
* QRA Locator to Latitude/Longitude (and back).
* Radio Horizon calculator.
* Satellite Orbits.
* Timers.
* Zener Diodes.
* Resonance and bandwidth.
* Metric and other conversions.

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Software: 
HamCalc calculators for radio amateurs