Eight free calculators — antenna sizing, circuit math, signal budgets, safety distances, and live license lookup. All run in your browser.
Full-wave, half-wave, and quarter-wave dimensions for any frequency in feet and meters.
Solve for voltage, current, resistance, or power — enter any two, get the other two.
Enter output frequency, get transmit frequency and standard offset for any amateur band.
Convert dB to power/voltage ratios. Calculate antenna gain, path loss, and link budgets.
Signal loss in RG-58, RG-8X, LMR-240, LMR-400 at any VHF or UHF frequency.
How much power actually reaches your antenna at any SWR reading.
Minimum safe distance from your antenna based on power, frequency, gain, and duty cycle.
Look up any FCC call sign — status, expiration date, days until renewal needed.
Also useful: The interactive Exam Day Checklist Generator and free PDF downloads for printing.