Skywave: RF Field Kit

Skywave is a complete amateur-radio and RF reference that runs entirely on your device. Every lookup and every calculation happens locally — so the whole shack works on a summit, in a basement, on a plane, or anywhere the signal drops. No account. No subscription. No cloud round-trips. Nothing you enter ever leaves your iPhone or iPad. Built for licensed hams, shortwave listeners, preppers, and anyone who wants serious RF tools without ads or logins. REPEATER DIRECTORY • 22,000+ repeaters worldwide, searchable offline by callsign, city, or network • Output and input frequency, shift, CTCSS/DCS access tones, mode and status • Filter by band, mode, digital-only, tone, or operational status • Sorted by distance from your location, with bearing, distance and a map for each BAND PLANS & PRIVILEGES • Full US HF/VHF/UHF band plan by license class (Novice → Extra) • Tap in any frequency to see who may operate there, in which modes, at what power • Grouped by LF/MF/HF/VHF/UHF with per-segment detail ANTENNA & FEEDLINE MATH • Dipole, quarter-wave vertical, 3-element Yagi and full-wave loop dimensioning in metres and feet • Coax loss for a dozen common cable types, including the extra loss from SWR • VSWR, return loss and mismatch loss from power, or from a complex load impedance • Propagation: free-space path loss, radio horizon, dBm ↔ watts GRID & GEODESY • Maidenhead grid ↔ latitude/longitude conversion • Great-circle bearing (short and long path) and distance between any two grids or cities • A bundled database of 230,000+ world locations for instant grid and beam headings SATELLITES • On-device SGP4 orbital propagation from bundled amateur two-line elements • Live look angles — elevation, azimuth, range, sub-satellite point and altitude • Pass predictions for the next 48 hours from your station, with AOS/LOS and max elevation • Real-time Doppler shift for any downlink frequency CALLSIGN / DXCC LOOKUP • Resolve any callsign or prefix to its entity and continent • Beam heading, short/long path and distance from your grid CW / MORSE TRAINER • Send any text as clean, click-suppressed Morse synthesised on-device • Koch-method practice with adjustable character sets and group counts • Full reference chart; adjustable speed, Farnsworth spacing and sidetone PRIVATE BY DESIGN Skywave collects nothing and connects to nothing. Location is used only on-device to set your grid and sort nearby repeaters, and it degrades gracefully when unavailable. Bundled reference data is drawn from openly-licensed public sources (HearHam repeater listing, GeoNames under CC-BY, CelesTrak/AMSAT public TLEs, the ITU call-sign series and the FCC/ARRL US band plan) and is fully attributed in-app. Skywave is a reference tool. Verify current regulations and refresh satellite elements before operating. Not affiliated with the FCC, ARRL, AMSAT, CelesTrak, GeoNames or HearHam.