Plain-language answer: Many digital modes have high duty cycles, so average heating in transmitters, tuners, transformers, loading coils, connectors, and power systems can be much greater than during intermittent voice operation.
Why it matters in the complete station
A component’s SSB peak rating may not apply to a long continuous transmission. Distortion and overdrive can also widen the signal without improving decoding.
What to do in the field
Follow the lowest applicable continuous or digital rating, reduce audio drive and RF power, monitor ALC and temperature, and allow cooling time.
The common mistake
Using the SSB wattage rating for every digital waveform and duty cycle.
Safety boundary
Stop work around power lines, lightning, unstable supports, unsafe wind or ice, damaged components, or uncontrolled public access. Current product guides, component ratings, site rules, electrical code, license conditions, and RF-exposure requirements control the final installation.
