Free, browser-based tools for amateur radio operators — run nets, trim antennas, size feedline, find your grid. Built by hams, for hams.
Net logging & control — schedule recurring nets, log check-ins with automatic FCC callsign lookups, give your club a live view of who's on the air, and get a printable report when you close the net.
Your wire is resonant — just not where you want it. Enter where the SWR dips now and where you want it, and get the exact length to cut or add, per leg.
How much of your power actually reaches the antenna? Loss by cable type, length, frequency, and SWR — plus the SWR your radio really sees.
Your Maidenhead grid square from GPS or coordinates, and distance & bearing between any two grids — for contests, satellites, and QSO logging.
Live NOAA solar data turned into a plan — a 24-hour, band-by-band heatmap of what should be open at your grid, and the best bets right now.
Upcoming amateur satellite passes over your grid for the next 48 hours — AOS, peak elevation, and where to point the antenna.
Auto-find the repeaters near your grid, pick the ones you use, and print a wallet-size card for the go-bag.
Fast POTA/SOTA field logging — type a callsign, hit Enter. Park lookups, P2P tracking, and clean ADIF export for upload.
Who's activating a park right now — live spots with band, mode, and distance-from-you filters.
The sun's mood, translated — flux, Kp history, flare class, and solar wind, refreshed from NOAA.
The worldwide DX cluster feed, filtered by band — what's being worked right now.
The world as your beam sees it — a printable great-circle map centered on your grid.
Takeoff angle per band at any height — see what raising the wire ten feet actually buys.
Turns counts for chokes, baluns, and loading coils — toroids by AL value, air core by Wheeler.
Quarter- and half-wave stub lengths by velocity factor — harmonic notches and phasing lines.
How far two stations can talk line-of-sight on VHF/UHF, from both antenna heights.
Will the battery last the activation? Capacity, draw, and duty cycle in — honest hours out.
A pre-departure checklist for field ops — check it off as it goes in the bag, printable.
Watts, dBm, S-units, and gain chains — decibel arithmetic without the mental gymnastics.
Where your license class can operate, band by band — Technician, General, or Extra.
A clean, classic QSL card with your station details — print on cardstock and mail it.
The real FCC question pools as flashcards and practice exams — misses repeat until they stick.
Learn Morse the Koch way — full-speed characters, Farnsworth spacing, graded copy.
The shack clock, in your browser — UTC and local time, solar indices, and propagation conditions at a glance.
Plan your club's ARRL Field Day — stations, bands, operator shifts, and logistics in one place.
Clubs share their opening scripts — browse, copy, and adapt into Roll Call.
Your club's nets, repeaters, and reports on one public page.
Your reception reports from PSK Reporter, mapped — waiting on upstream API access.