Operating modes
Phone, Morse code, digital and video: how each mode works and how to use it.
Voice (phone)
Talking on the air.
FM voice operationRepeaters, simplex and the "local" mode.SSB voice operationHF phone: tuning, sidebands and clarity.AM operationThe oldest voice mode, still in use.Repeaters and how to use themOffsets, tones and etiquette.Simplex operationDirect radio-to-radio contacts.Voice nets and net procedureRunning and joining a net.
CW (Morse code)
The oldest digital mode, and still one of the most effective.
What CW is and why it enduresA narrow, efficient mode that gets through.The Morse alphabet and timingDits, dahs and spacing.Learning Morse codeKoch, Farnsworth and daily practice.Straight keys, paddles and bugsHardware for sending.CW procedure and prosignsCalling, QSOs and signing off in Morse.CW contesting and the Reverse Beacon NetworkFast exchanges and automated decoding.QRP CWMaking contacts on a few watts.Decoding CW by ear and by computerLearning to copy and what software can do.
Digital data modes
Keyboards, computers and sound cards on the air.
Digital modes overviewThe landscape of data modes and what each is for.PSK31Keyboard chat in 31 Hz.RTTYThe original radioteletype.FT8 and FT4Weak-signal 15-second and 7.5-second modes.JS8CallKeyboard messaging built on FT8.WSPRPropagation beacons with milliwatts.JT65, JT9 and the WSJT familyWeak-signal modes for EME and HF.MFSK, Olivia and ContestiaRobust modes for poor conditions.Packet radio and AX.25Digital messaging with nodes and BBSs.APRSPosition and message reporting.Winlink and radio emailEmail over HF and VHF.VARA, ARDOP and PACTORHigh-speed ARQ data modes.Digital mode softwareWSJT-X, fldigi and friends.
Digital voice and linked networks
Voice carried as data, and repeaters joined over the internet.
Image and video
Pictures and moving pictures by radio.