Amateur Radio

Antennas, SWR, HF propagation, repeater coverage, RF exposure, and contest scoring for amateur radio operators.

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Calculate trap capacitor and inductor values for multi-band wire antennas. Includes coil winding data and impedance analysis.

Calculate ham radio contest score from QSOs, multipliers, and bonus points. Includes rate analysis and multiplier vs QSO strategy comparison.

Calculate Morse code words per minute from dot timing. Includes dash, gap durations, and Farnsworth spacing support.

Estimate Maximum Usable Frequency (MUF), optimum frequency, and hop count from solar flux index, time, distance, and season.

Calculate great circle distance and bearing between two Maidenhead grid squares for QSL cards and contest logging.

Estimate repeater coverage radius from antenna height, power, terrain type, and mobile antenna parameters.

Calculate power density at distance for FCC RF exposure compliance. Checks controlled and uncontrolled environment MPE limits.

Estimate satellite pass parameters including duration, max elevation, Doppler shift, and orbital period for amateur radio satellites.

Calculate percentage of power lost from SWR mismatch. Shows reflected power, mismatch loss, additional feedline loss, and power delivered to antenna.

Calculate wire length for dipole, vertical, loop, end-fed, and G5RV antennas by frequency and band. Includes height analysis.