Power up the radio transmitter is a quest objective in the mission Taking Independence in Fallout 4.
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To complete this objective, you will need to use the Castle's Workbench. It takes 10 Power to get the Radio Transmitter running. This can be done with 1 Large Generator, 2 Medium Generators or 4 Small Generators/Windmill Generators. If you do not immediately have the supplies, fast travel to nearby markets with the needed components marked. Visit Vendors and pick up the needed supplies in the form of Junk or Shipments. Just connect the generators to the central Tower to complete this objective.