FT4 vs FT8 - A new Ham Radio mode, what's the difference? - YouTube
Guide to using FT4 on satellites | AMSAT-UK
Faster, More Contest-Friendly FT4 Digital Protocol to Debut in a Week
MSHV Set Up For FT4 DX Contest | LZ2HV Amateur Radio Website
Ham Radio Digital Modes: Joe Taylor talks FT8 and introduces FT4 | The SWLing Post
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,
WX4MH - Callsign Lookup by QRZ Ham Radio
Ham Radio Deluxe 6.7.0.269 FT4 Release (revised) - YouTube
MSHV Set Up For FT4 SPRINT Fast Training | LZ2HV Amateur Radio Website
投稿採用分には掲載誌や粗品を贈呈>CQ ham radio編集部が「FT4運用体験記」を募集中 | hamlife.jp
SDR Control for Icom iPad version 1.0.21 released – Mac Ham Radio
WSJT-X version 2.1.0-rc5 – introducing the FT4 Protocol for Digital Contesting – Mac Ham Radio
FT4 vs FT8 - A new Ham Radio mode, what's the difference? - YouTube
Digirig Mobile - Integrated Digital Modes Interface for Amateur Radio (Rev 1.9)