QSO Central

QSO Central is the all-in-one companion for amateur (ham) radio operators and anyone studying for their license. No account, no sign-in, no ads, no tracking. The study and station tools work completely offline — perfect for the field, a contest site, or a basement shack with no signal. A set of optional Live features add real-time information when you're connected. LICENSE EXAM PREP (offline) • Full official NCVEC question pools: Technician, General, and Amateur Extra • Flashcards, browsable and searchable questions, and a realistic practice exam with instant grading • Missed-question review and progress by subelement, saved on your device • Diagrams included for the questions that need them STATION TOOLKIT (offline) • U.S. Band Plan — slide across any band to see mode, common use, and exactly what your license class may transmit, color-coded by privilege • Antenna calculators — dipole, vertical, and wavelength, plus SWR, coax loss, feedline impedance, and balun • Electrical calculators — Ohm's Law and battery runtime & capacity • Grid Square tools — your Maidenhead grid from GPS, plus distance and bearing between grids, on a map • Morse Code trainer — characters, random groups, callsign practice, and head-copy with adjustable speed and Farnsworth timing • Logbook — log your contacts and export standard ADIF and CSV files • Contest clock — a live UTC clock over a reference of major recurring contests • Emergency Comms — ICS forms reference, your own frequency plans, local repeaters, and contacts REFERENCE LIBRARY (offline) • The full text of 47 CFR Part 97 (the FCC amateur rules), plus plain-language summaries of common topics — Q-codes, phonetics, repeaters, operating procedures, and more • Everything searchable, everything offline LIVE (optional, needs internet) • Callsign Lookup — U.S. lookups with no account required; optionally add your own QRZ.com or HamQTH account for worldwide results • Propagation — current solar indices and day/night band conditions • Repeater Directory — find nearby repeaters with offset, tone, and mode, in a list or on a map • On the Air — a live feed of current POTA (Parks on the Air) activations, in a list or on a map • Satellites — upcoming passes for amateur satellites from your location, with a sky-track plot for each pass, favorites, and search Each Live screen credits its public source and keeps its last result so you can still see it offline. AR SKY VIEW Hold your phone up to the sky and see where a satellite is right now, overlaid on the camera — a quick way to point a handheld antenna. The camera is a live preview only; nothing is recorded. HELP WHEN YOU WANT IT Built-in, step-by-step guides cover the AR sky view, callsign lookup sources, logging and exporting, and setting up your operator profile. PRIVACY BY DESIGN QSO Central runs no servers and has no accounts, ads, trackers, or analytics. Your logbook, progress, and settings stay on your device. Your location is used only on your device — to show your grid, sort what's nearby, and work out where satellites are in your sky — and is never transmitted; you can skip it and type your grid by hand. The Live features send only what's needed to answer your request (for example, the callsign you look up) directly to the public service that provides it. Set your license class and home grid once in Settings, and the whole app tailors itself to you. QSO Central is an independent app and is not affiliated with the FCC, ARRL, NCVEC, QRZ.com, HamQTH, or POTA.