Select Modes & Software
1 hourChoose digital modes matching band conditions and licensing privileges.
Intermediate3-5 days
Digital Modes Setup
Complete guide for digital modes setup — step-by-step workflow, tools, checklist, and expert tips to get started.
FT8/JS8 operatorsWinlink usersVHF packet enthusiasts
Workflow
Configure Audio & PTT Interface
2 hoursSet levels for clean TX audio and proper VOX/PTT timing without splatter.
Set Filters & Occupied Bandwidth
1 hourConfirm emission bandwidth fits band segment and filter skirts reject splatter.
Test Decode & SNR Margins
2 hoursRun QSO tests and measure minimum SNR for reliable copy.
Automate Logging & Spotting(Optional)
1 hourIntegrate digital logger with PSK Reporter or DX cluster feeds.
Tools Used
- Modulation BandwidthPrimary
Verify occupied bandwidth fits band segment for chosen mode.
- Signal-to-Noise RatioPrimary
Estimate minimum SNR for reliable digital decode.
- Filter Cutoff FrequencySupporting
Set IF and audio filters to pass mode bandwidth.
- Decibel (dB) ConverterSupporting
Convert reported dB values to power ratios for comparison.
- Frequency to WavelengthReference
Confirm operating frequency within digital subbands.
Checklist
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Hardware
Calibration
Software
Compliance
Validation
Documentation
Reference Materials
Common Digital Mode BandwidthsTable
Approximate occupied bandwidth by mode.
| Mode | Bandwidth | Typical Band |
|---|---|---|
| FT8 | ~50 Hz | HF weak-signal |
| JS8 | ~16 Hz | HF marginal SNR |
| RTTY | ~250 Hz | HF/VHF |
| APRS | ~12.5 kHz | VHF packet |
SNR vs CopyFormula
Decode threshold depends on mode; FT8 often decodes near −24 dB SNR in 2.5 kHz.
ALC WarningSafety
Driving ALC on SSB for digital modes creates IMD splatter — keep mic gain low and ALC at zero.
Clock Sync Is Critical
FT8/JS8 fail with >1 s clock error — enable automatic NTP.
Start on 20 m FT8
Busy but forgiving — good place to learn waterfall operation.
Watch for Overdrive
Distorted TX audio reduces decode for others and invites reports.
Safety Notes
- Digital modes can hold transmitter keyed for long periods — monitor PA temperature and duty cycle limits.
- Ensure third-party traffic rules are followed when using Winlink for non-amateur recipients.