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Yes I understand, but I was telling about the system that was used from the italian importer of those Zenith tv sets in the first seventies. Today no device is longer necessary because whatever digital decoder or DVD player has the video output available with NTSC or PAL system. A RF modulator with 4.5 MHz intercarrier frequency is necessary for the US TV set, because if you don't want modify the cicuits, you only can connect them with the antenna RF input.
Last edited by radiomec; 03-30-2013 at 09:36 AM.
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