Better signals.
Smarter operating.
Free, practical tools for amateur radio operators. Calculate your antenna, find your bearing, understand your contest log — all in your browser.
Tools that get used.
No signup, no paywall. Real calculations, instant answers.
Dipole Calculator
Half-wave dipole length for any frequency, in metres and feet.
Open tool ↗〰02 / FEEDLINECoax Loss Calculator
Estimate attenuation, cable efficiency and delivered power.
Open tool ↗↗03 / POWERERP / EIRP
Calculate effective radiated power from TX, losses and gain.
Open tool ↗⊞04 / LOCATIONMaidenhead Locator
Convert coordinates to grid squares and back.
Open tool ↗◎05 / DXDistance & Bearing
Great-circle heading and distance between grid locators.
Open tool ↗λ06 / RF BASICSWavelength Calculator
Wavelength and quarter-wave dimensions in one click.
Open tool ↗dB07 / RF BASICSdB / Power Converter
Translate decibels into power ratios and back.
Open tool ↗▥08 / CONTEST LABCabrillo Log Analyzer
Find band activity, operating hours and QSO rate patterns.
Analyze log ↗RF Workbench.
Engineering estimates only. Verify antenna dimensions, cable data, local RF exposure and legal power limits before transmitting.
Every QSO tells a story.
Analyze your Cabrillo contest log locally. Your file stays on your device.
Drop in your Cabrillo log
Choose a .log, .cbr or .txt file. No upload to a server.
Load a log to see your band distribution, hourly rate and operating statistics.
Equipment insights.
Independent guides and practical comparisons are coming. No paid placements or affiliate links are currently active.
Transceivers
Receiver performance, ergonomics and contest workflows.
Antennas & Towers
Practical installations, trade-offs and operating considerations.
SO2R & Accessories
Switching, logging and station integration.
Built by an operator.
For operators.
OK6RA Ham Radio Tools is an independent project focused on useful, accessible tools for the amateur radio community.
We believe that good tools should be fast, understandable and available to every operator — whether you're making your first contact or optimizing a contest station.
Operator biography, verified contest results and expedition photos can be added before launch.
Get in touch ↗