Fallout 3 DLC problem

[SDon1969]

I remember reading about this awhile back - found this for you on the xbox forums:

"Once the DLC is downloaded, the quest objective for Operation: Anchorage will be activated by a radio broadcast stating, "This is Defender Morrill, any Outcasts listening on this frequency report to sector 7-B, Bailey's Crossroads. This is a high-priority message, backup is needed at our location. Any personnel listening on this frequency please report at once." A marker will appear on the world map but the player cannot immediately fast-travel to the location to begin the simulation. The DLC can be played at any time after the player exits Vault 101 at the beginning of the game. After completing the simulation, new equipment will be unlocked for the player to use in the rest of the game.

Link to The Vault

Be sure to check your radio signals. If you havent gotten it yet, try fast traveling to Megaton then waiting 10-15 mins (max)."