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Amateur Radio Toolkit is the best app for ham radio hobbyists. It contains many calculators to help you design radios and antennas for all your projects.

Tools:

Q code - A list of common Q codes

92 Code - A list of common 92 codes

RST code - A list of RST codes

Coordinate calculator - Find your latitude and longitude by entering your maidenhead square.

Grid square calculator - Find your maidenhead square by entering your latitude and longitude

Distance calculator - Find the distance between two Maidenhead squares

Unit converter - Convert between units

Location - Find your location

Dipole antenna - Calculate the optimal lengths of a dipole antenna for a given frequency

Vertical antenna - Calculate the optimal lengths of a vertical antenna for a given frequency

Cubical quad antenna - Calculate the optimal lengths of a cubical quad antenna for a given frequency

Inverted Vee antenna - Calculate the optimal lengths of an inverted vee antenna for a given frequency

Ground plane antenna - Calculate the optimal lengths of a ground plane antenna for a given frequency

J pole antenna - Calculate the optimal lengths of a J pole antenna for a given frequency

VSWR - Convert between VSWR, Refection coefficient, return loss and mismatch loss

Three element Yagi antenna - Calculate the optimal lengths of a three-element Yagi antenna for a given frequency

Seven-element Yagi antenna - Calculate the optimal lengths of a seven element Yagi antenna for a given frequency

Wavelength frequency converter - Convert between wavelength and frequency

Air core inductor - Calculate the inductance or lengths of an air core inductor

Low pass filter - Calculate the units of an RC or RL LPF circuit

High pass filter - Calculate the units of an RC or RL HPF circuit

Ohm's law - Convert between voltage, current, resistance and power by entering two

Reactance - Calculate the reactance of a capacitor or inductor

Decibel calculator - Convert between decibel values or calculate dB by entering the power or voltage

Voltage divider - Calculate the output voltage or resistance of one resistor

Resistor Color codes - Find the resistance of a resistor by entering the colors of the bands

Resistors in parallel - Calculate the resistance of resistors in parallel

Resistors in series - Calculate the resistance of resistors in series

Capacitors in parallel - Calculate the capacitance of capacitors in parallel

Capacitors in series - Calculate the capacitance of capacitors in series

Coaxial cable - Calculate the properties of a coaxial cable

Morse code

CW abbreviations

NATO phonetic alphabet

You can upgrade to the Pro version to remove all ads and get the following features:

Half wave coax balun - Calculate the optimal length of a half wave coax balun for a given frequency

Narrowband balun - Calculate the inductance and capacitance of a narrowband balun

Small magnetic loop - Calculate the optimal lengths of a small magnetic loop for a given frequency

Full wave loop antenna - Calculate the optimal lengths of a full wave loop antenna for a given frequency

ERP and EIRP - Calculate and convert ERP and EIRP

RMS voltage - Calculate the RMS voltage

Pi attenuator - Calculate the values of the resistors by entering the attenuation and impedance

T attenuator - Calculate the values of the resistors by entering the attenuation and impedance

Inductors in series - Calculate the inductance of inductors in series

Inductors in parallel - Calculate the inductance of inductors in parallel

Doppler shift - Calculate the Doppler shift