Tools
Calculators and trainers for studying and for the shack. They run entirely in your browser and work offline once the page has loaded.
- Antenna lengthDipole and quarter-wave lengths for any frequency, plus feed line wavelengths.
- Wavelength explorerDrag across the spectrum to see wavelength, antenna size and who may transmit.
- Ohm's law and powerSolve voltage, current, resistance and power from any two values.
- SWR and matchingSWR, reflection coefficient, return loss and power delivered to the antenna.
- DecibelsConvert power changes to decibels, and watts to dBm.
- Morse code trainerHear text as Morse at any speed and practice Koch lessons.
- Grid square locatorFind your Maidenhead grid, and the distance and heading to another.
- Reactance and resonanceInductive and capacitive reactance and the resonant frequency of L and C.
- Phonetic spellerSpell a call sign or message with the ITU phonetic alphabet.
- UTC clockThe current time in UTC, the standard for logs and schedules.
Looking up what you may transmit on a frequency? Use the band chart lookup.