Faster, More Contest-Friendly FT4 Digital Protocol to Debut in a Week
FT4 Frequencies
WX4MH - Callsign Lookup by QRZ Ham Radio
Ham Radio Deluxe - Active on HF SSB, FT8, FT4, CW: OA7/DD5ZZ Peru by Alex, DD5ZZ, 30 Jul - 17 Sep 2021; If this isn't yet in your Ham Radio Deluxe logbook,
Ham Radio: WSJT-X Tips and Tricks #ft8 #ft4 #nd3n #amateur radio - YouTube