Realistic HF conditions with QSB, QRM, chirp, and noise effects
Real-world amateur radio conditions include fading, interference, and equipment characteristics. Training with these effects prepares you for actual on-air conditions and improves your copying skills dramatically.
Effect: Gradual signal strength changes
Cycle: 7-second fade in/out pattern
Depth: 20% to 100% volume variation
Cause: Ionospheric propagation changes
Effect: Frequency slides at tone start
Amount: 50 Hz frequency shift
Duration: 50ms chirp period
Sound: "wee" on each dit/dah
Effect: Human keying irregularities
Timing: ±20% element duration variation
Keying: Variable rise/fall times
Realism: Operator "fist print"
Type: Competing CW station
Frequency: +75 Hz offset
Level: 30% of main signal
Pattern: Random morse at 25 WPM
Type: Pink noise (1/f spectrum)
Levels: S3, S5, S7, S9 noise floor
Effect: Atmospheric HF noise
Realism: Band-specific characteristics