resulting in interference to other stations using the band. Engineers and technicians re-fer to this as splatter.Frequency and phase modulationBoth AM and SSB work by varying the signal strength. This can be a disadvantage whenthere is sferic noise caused by thundershowers in the vicinity. Sferics are recognizable as“crashes” or “crackles” in an AM or SSB receiver. Ignition noise can also be a problem;482 Data transmission26-8Spectral display of atypical voice SSB signal.In this case, it is the lowersideband.26-9An SSB transmitter.