Tools
Use the workflow cards when you need an operating decision, then drop into the full tool directory for deeper calculations and references.
Start here
Pick a common operating workflow, then go to the full tool directory to find the tools you need.
Check propagation
See current MUF, LUF, band conditions, and find the best bands before you spin the dial.
Find the right band
Go from band choice to typical digital frequencies and where to begin.
Find distance and heading
Compare stations, find distance and azimuth before aiming a beam or calling CQ.
Design an antenna
Start by sizing the radiator, then evaluate feedline and deployment choices.
Antenna Design and Feedlines
Design wire and vertical antennas, compare feedline choices, and move from rough sizing to field deployment.
Antenna Designer
Antenna calculator is a hub for dipole, EFHW, random wire, vertical, and ground plane tools.
Dipole Length
Calculate half-wave dipole total length and leg length for a target band or frequency.
OCF Dipole
Size an off-center-fed dipole and compare common feed-point splits.
End-Fed Half-Wave
Estimate EFHW wire length and review practical harmonic-band coverage.
Random Wire
Choose practical non-resonant wire lengths and counterpoise starting points.
Quarter-Wave Vertical
Calculate radiator and radial lengths for a simple quarter-wave vertical.
Ground Plane
Size radiator and radial lengths for a classic ground-plane antenna.
Yagi
Estimate element lengths, spacing, and starting-point performance for a small Yagi.
Coax Loss Calculator
Estimate feedline loss so you can compare cable choices before installation.
Wavelength Calculator
Convert frequency to full-wave, half-wave, quarter-wave, and 5/8-wave lengths in meters and feet.
Wire Deployments
Review portable and backyard installation patterns before putting wire up.
Station Math and Safety
Check power, mismatch, battery runtime, and RF safety before you key up or commit to a station setup.
ERP / EIRP Calculator
Estimate effective radiated power from transmitter output, feedline loss, and antenna gain.
RF Exposure Calculator
Estimate conservative RF exposure conditions from power, gain, frequency, duty factor, and distance.
SWR / Return Loss Calculator
Convert SWR to return loss, reflected power, mismatch loss, and related tuning values.
Battery Runtime Calculator
Estimate portable operating time from battery size, current draw, operating mix, and reserve.
Maps, Propagation, and Operating Utilities
Use these when deciding whether a path is worth trying, where to listen first, and how to point or position the station.
Solar Conditions
Review solar flux, Kp, A index, solar wind, and flare context when you want the telemetry behind the propagation view.
Full Propagation View
See estimated MUF, LUF, band conditions, trends, and practical operator guidance in one page.
MUF and LUF Explained
Learn what MUF and LUF mean, what changes them, and how to use them when choosing a band.
Digital Mode Frequency Finder
Interactive lookup for common FT8, FT4, RTTY, PSK31, JS8Call, and WSPR frequencies by band and mode.
Grid Square Lookup
Find Maidenhead grid squares from a location search and get related operating context.
Grid Distance Calculator
Measure distance and beam heading between two Maidenhead grids, coordinates, or station locations.
Beam Heading Calculator
Calculate initial and reciprocal azimuth between two stations using grids, coordinates, or address lookups.
ITU, CQ & Grid Square Map
Overlay contest zones and grid information on an interactive map.
International Operating
Check whether a US amateur license may fit CEPT, IARP, automatic reciprocal, or permit-based travel paths.