Ham Radio Digital Mode Calculators
Eight digital mode calculators for amateur radio: WSPR SNR antenna comparison, FT8 link budget, RBN comparison, baud rate and bandwidth, Shannon channel capacity, noise figure cascade, APRS range, and digital mode SNR threshold comparison.
WSPR Antenna Comparison (SNR Difference)
Compares two antennas using WSPR spot SNR reports. Shows dB difference, equivalent power ratio, and statistical significance.
FT8 / FT4 Link Budget Calculator
Received SNR estimate for an FT8 or FT4 contact given transmit power, antenna gains, path loss, and receiver noise figure. Predicts decode probability.
Reverse Beacon Network (RBN) Comparison
Statistical comparison of two antennas using RBN spot data. Shows dB difference with 95% confidence interval.
Baud Rate to Bandwidth Calculator
Occupied bandwidth for common digital modes from baud rate and modulation type. Includes standard mode bandwidths for reference.
Shannon Channel Capacity Calculator
Maximum theoretical data rate for a channel with given bandwidth and SNR using the Shannon-Hartley theorem. Useful for comparing digital mode efficiency.
Noise Figure and Noise Temperature Calculator
Converts between noise figure (dB) and noise temperature (K). Also calculates cascaded noise figure for a receive chain using Friis formula.
APRS Path and Range Calculator
Estimates APRS coverage radius for a given TX power, antenna height, and path setting. Also recommends appropriate WIDE path settings.
Digital Mode SNR Threshold Comparison
Minimum SNR threshold, bandwidth, and relative sensitivity for common digital modes. Shows the dB advantage of each mode over SSB voice.