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upconverters and modulators.

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canniva11
upconverters and modulators.

can someone please explain the difference between a modulator and upconverter??
whats the diference between a IF and RF? The Upconverters are desing for Digital Signals?
Can i use a analago agil modulator for a CMTS DS ports?

Please, Help me understand! and sorry to bother you people.

Juan