Radio & RF

Radio links, antennas, cable loss, dBm, SWR and LoRa.

Antenna Array SimulatorSimulate linear and planar antenna arrays and phased arrays: radiation pattern, beam steering, directivity, beam width, side lobes, tapers and element phases.Antenna Length CalculatorCalculate the wavelength and the lengths of a half-wave dipole, quarter-wave ground plane, 5/8 vertical, full-wave loop and coax stubs for any frequency.Coax Cable Loss CalculatorCalculate the loss of coax cables like RG-58, RG-213, Aircell 7, Ecoflex and LMR-400 over length and frequency – compare all types, with SWR and connectors.dBm ConverterConvert dBm to watts and back, plus dBW, dBµV, dBmV and volts at 50 or 75 Ω – with EIRP, ERP and field strength.Smith Chart & L-Network MatchingMatch a load impedance to 50 Ω with an L-network: all solutions with inductor and capacitor values, standard values, Q, bandwidth and the Smith chart path.Link Budget CalculatorCalculate a radio link: free-space path loss, received power, link margin and maximum range, plus Fresnel zone, earth bulge and radio horizon.LoRa Airtime CalculatorCalculate the time on air of LoRa, LoRaWAN and Meshtastic packets, messages per hour within the 1 % duty cycle, TTN fair use and receiver sensitivity.Noise Figure Calculator (Friis)Calculate the cascaded noise figure, gain and noise temperature of a receive chain with the Friis formula – plus sensitivity, IIP3 and the share of each stage.SWR CalculatorConvert SWR, return loss and reflection coefficient, compute the SWR from forward and reflected power or a load impedance – with mismatch and cable loss.