Stalker: Call of Pripyat → Quests → Recon Drone (Notes of a Strelok)
Next, you'll see Strelok's caches marked on your map. Well, let's take it. Azot will ask us for money for repairs, and we agree. If you want a discount, it's only 1,000 rubles. You can come back for the module a couple of hours after you give it to Azot.
In the far northwest of Jupiter's environs, you can find a crashed reconnaissance module, from which you can retrieve a black box containing Strelok's recordings. But reading them won't be easy; you'll need to take the box to Azot on Yanov;
See also:
How to defeat Skeletron (guide)