SWLtools

NEW: THE DECODE TAB SWLtools no longer just records and displays signals — it reads them. • Morse (CW). The app locks onto the tone by itself and measures the sending speed from the signal, so it follows hand-sent Morse as well as machine-sent. Each transmission starts on a new line when the operator hands over, and a side panel collects the callsigns heard, leaving out the ones that were only a misread of another. • RTTY, in both ITA2 and SITOR-B. • Weather fax (WEFAX). The chart builds up line by line as it arrives and can be saved straight to the photo library. • ACARS aircraft messages, with the ones carrying a position shown on a map. Decoded text can be saved, reopened later and shared. AUDIO CHAIN • I/Q sample-delay correction. USB audio adapters do not sample their two channels at the same instant, and that small gap puts a mirror image of every signal on the wrong side of the spectrum, growing worse away from centre. The delay can now be corrected, and the mirror drops out of sight. • The app tells you what your adapter can and cannot do — full I/Q spectrum, speaker monitoring — instead of letting you find out by trial. • A new audio diagnostics panel shows what iOS is actually doing with the signal: route, format, buffers, and whether the monitor has quietly taken the dongle away. • If microphone access is denied, the app now says so and explains why nothing can be received: iOS routes USB audio adapters through that same permission. • The screen no longer goes dark while a decoder is running. ELSEWHERE • All times, on screen and in saved files, are now UTC — the way radio logs are kept. • Recordings can be turned into a video to share. • Corrected instructions: listening through the phone while recording needs a two-channel interface, which the old text did not say.