The slower signals are sent using a different antenna using the same frequency channel.
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For its TV channel, the BBC rented a frequency on Eutelsat's Hotbird, the most popular satellite in Iran for TV watchers.
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All radios sync to a control channel, which dynamically coordinates voice channel usage and who is assigned to what frequency at any given moment.
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Like a cordless phone looking for a clear channel, it can hop on to a less crowded frequency to send the next burst.
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On channel boosters quickly receive the OTA signal from the main tower and retransmit the signal on the same frequency.
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