Added in late 2012 , this phase modulation has no effect on popular radio - controlled clocks which consider only the carrier 's amplitude .
Added in late 2012 , this phase modulation will cripple ( rare ) receivers that track the carrier phase .
Added in late 2012 , this phase modulation has no effect on popular radio - controlled clocks which consider only the carrier 's amplitude , but will cripple ( rare ) receivers that track the carrier phase .