Eastern Bloc governments did not use jammers to prevent people from listening to Radio Luxembourg, but did do so for Radio Free Europe and, since the stations used harmonic frequencies (1439 kHz for Luxembourg and 719 kHz for Free Europe), the jamming also affected Radio Luxembourg's signal.
In contrast to Eastern Bloc governments, which did not use jammers to block listeners from tuning into Radio Luxembourg, they did employ jamming techniques against Radio Free Europe. The similar frequencies used by both stations (1439 kHz for Luxembourg and 719 kHz for Free Europe) meant that the jamming also disrupted Radio Luxembourg's signal.