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There's only one:

-- In a receiving dish, the collected and focused electromagnetic energy changes

to electrical energy in the feed, LNA, or LNB at the focus of the dish.

-- In a transmitting dish, the electrical energy from the transmitter changes to

electromagnetic energy, either at the focus of the dish if the transmitter is mounted

there, or else some distance from the dish and then moved to the focus through a

hollow 'waveguide'.

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