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ILS produces:1) a radiation pattern which is amplitude modulated by the VHF frequency of the ILS2) a 90 Hz lobe and a 150 Hz lobe which are amplitude modulated by the VHF frequency of the ILS3) a radiation pattern which is amplitude modulated by a 90 Hz and a 150 Hz signal4) two lobes modulated in frequency by a 90 Hz and a 150 Hz signal

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