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Digital Modes

Mode Cycle Bandwidth Sensitivity (dB) Typical Use Common HF Dial Frequencies (kHz)
FT4 7.5 s ~90 Hz ≈ −16.5 Contests, faster QSOs 3575, 7047.5, 10140, 14080, 18104, 21140, 24919, 28180
FT8 15 s ~50 Hz ≈ −21 DXing, general weak-signal 3573, 7074, 10136, 14074, 18100, 21074, 24915, 28074
JT9 60 s ~15 Hz ≈ −24 Very weak HF signals 3576, 7076, 10140, 14078, 18102, 21078, 24917, 28078
JT65 60 s ~175 Hz ≈ −24 Weak-signal heritage, EME 3576, 7076, 10138, 14076, 18102, 21076, 24917, 28076
WSPR 2 min ~6 Hz ≈ −28 to −31 Propagation beacons 3568.6, 7040.6, 10140.1, 14095.6, 18104.6, 21094.6, 24924.6, 28124.6
Q65 30–120 s 100–3000 Hz ≈ −27 Scatter, EME, tropo Shares FT8/JT65 segments depending on band & activity
FST4 15–180 s 6–60 Hz ≈ −30 LF/MF weak-signal (2200/630 m) 137.5, 474.2 (kHz center frequencies)
MSK144 Burst ~200 Hz ≈ −8 Meteor scatter (VHF) 50.260, 50.280, 144.360 (MHz)

Note: Frequencies listed are typical “dial” frequencies (USB mode) used worldwide. Regional band plans may vary slightly (especially on 40 m and 60 m).

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