Key to the Tower

 is a Quest in Escape from Tarkov.

Dialogue
"I have good news and bad news, which one should I start with? I'll start with the good news! We've proved our potential. Lightkeeper is pleased with us, and wants to meet you in person... Yes, you specifically. The bad news is you can't get to him that easily, the place is rigged with land mines. Plus, a sniper shoots everyone who comes near the lighthouse. We must somehow let them know that it's you, among all the other PMCs that are sniffing around there. So we'll put together a transponder for you. He will pick up the signal, give a sign to the sniper, and disable the mines. The path will be safe. I've already written down what materials I need to assemble it. Finding the transmitter box won't be easy, but I think you could try looking somewhere where the USECs settled down."

Objectives

 * Hand over the 2 found in raid  Pieces of plexiglass
 * Hand over the found in raid  Insulating tape
 * Hand over the 2 found in raid  Military circuit boards
 * Hand over the found in raid  Military COFDM Wireless Signal Transmitter
 * Hand over the found in raid  Working LCD
 * Obtain the Radio transmitter body on Lighthouse
 * Hand over the Radio transmitter body

Rewards
"Alright, we have everything we need, that's good."
 * +30,500 EXP
 * Mechanic Rep +0.01

Guide
In this quest you have to find the radio transmitter body on Lighthouse and the required items in raid. The transmitter body has multiple spawns throughout the location.

First spawn
At the water treatment plant, on a table next to a red container in the northeast. 

Second spawn
At the water treatment plant, on the concrete mixer truck in the southeast. 

Third spawn
At the water treatment plant, ontop of the southern tower on a wooden crate next to a weapon box. 

Fourth spawn
At the water treatment plant, in a pile of packages next to a red container. 

Fifth spawn
At the water treatment plant, on a shelf in the northwestern shack. 

Sixth spawn
In the blue (northern) chalet, ontop of the fireplace. 

Seventh spawn
In the blue (northern) chalet, on the first floor in a package near the long tables. 

Eighth spawn
In the black (southern) chalet, on the first floor under the coffee table near the fireplace. 

Ninth spawn
In the black (southern) chalet, on the first floor on the ground between the dining table with the laptops and the room divider shelf. </li>

Tenth spawn
In sunken building at the shore, on the second floor on the ground by some wooden pallets. </li>

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