Cascade noise figure calculator
Online receive-chain noise figure calculator using Friis’s formula: the contribution of each stage separately, the noise temperature, and a comparison of where to put the preamplifier.
Receiver sensitivity and MDS calculator
Online receiver sensitivity calculator: the MDS noise floor from bandwidth and noise figure, conversion to microvolts, and a comparison with external band noise.
IP3, intermodulation and dynamic range calculator
Online IP3 calculator: intercept points from a two-tone measurement, the level of third-order products, the DR3 dynamic range and the effect of an attenuator.
S-meter calculator: S-points, dBm, microvolts
Online signal level converter: S-points ↔ dBm ↔ microvolts ↔ dBµV on the IARU scale, for HF and VHF.