During Mass Effect 3, many people on the Citadel need your help. Not only do they need you to save the Galaxy, but they also have a few smaller problems that require your assistance. In fairness, they don't always ask for your help, yet it's often worth lending a hand as it typically gains you experience, money, reputation, and some war assets.
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Plus, usually, all you have to do is acquire something for them, which is the case in the Target Jamming Technology quest. The issue is that the game doesn't explicitly tell you where the thing you need to acquire is located. All of that information is in this guide.
You can acquire the quest anytime after Priority: The Citadel 2 (the Cerberus Coup). However, you won't be able to complete it until Rannoch: Admiral Koris.
To pick the Target Jamming Technology quest up, head to the Presidium Commons on the Citadel. Then look for a Turian C-Sec officer in the lower section of the area, next to Apollo's Cafe.
You don't actually speak to the guy. You just need to overhear his conversation. Once you do, the game will automatically put the quest in your journal.
Alternatively, you can skip this part and head straight for the Jamming Tower Data - once Rannoch: Admiral Koris is available. When you acquire the data, you will get the quest, too.
Before you can get the Jamming Tower Data, you first need to meet with the Quarians and complete the Priority: Geth Dreadnought quest. After that, head to Rannoch to rescue Admiral Koris.
At one point during the Admiral Koris quest, you will need to disable two AA guns, which are in separate sections. The Jamming Tower Data is within the left AA gun area.
Once you're there and have killed every Geth in
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